diff --git a/core/lib/Drupal/Core/Database/Install/Tasks.php b/core/lib/Drupal/Core/Database/Install/Tasks.php
index d63a05e8da..7dfe5d0288 100644
--- a/core/lib/Drupal/Core/Database/Install/Tasks.php
+++ b/core/lib/Drupal/Core/Database/Install/Tasks.php
@@ -243,9 +243,7 @@ public function getFormOptions(array $database) {
     ];
 
     global $install_state;
-    // @todo the use of the coalesce operator below is needed to get
-    // migrate_drupal_ui tests pass on PHP 7.4.
-    $profile = $install_state['parameters']['profile'] ?? NULL;
+    $profile = $install_state['parameters']['profile'];
     $db_prefix = ($profile == 'standard') ? 'drupal_' : $profile . '_';
     $form['advanced_options']['prefix'] = [
       '#type' => 'textfield',
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
index 5417dabc4a..74340884d2 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
@@ -181,9 +181,7 @@ public function prepareRow(Row $row) {
     }
 
     $field_data = unserialize($row->getSourceProperty('field_data'));
-    // @todo the use of the coalesce operator below is needed to get
-    // migrate tests pass on PHP 7.4.
-    $row->setSourceProperty('field_settings', $field_data['settings'] ?? NULL);
+    $row->setSourceProperty('field_settings', $field_data['settings']);
 
     return parent::prepareRow($row);
   }
diff --git a/core/modules/locale/locale.bulk.inc b/core/modules/locale/locale.bulk.inc
index 7bfce52add..37c4522092 100644
--- a/core/modules/locale/locale.bulk.inc
+++ b/core/modules/locale/locale.bulk.inc
@@ -385,16 +385,12 @@ function locale_translate_batch_finished($success, array $results) {
       // file), simply do nothing.
       if ($results && isset($results['stats'])) {
         foreach ($results['stats'] as $filepath => $report) {
-          // @todo is_array check below is needed to get locale tests pass on
-          // PHP 7.4.
-          if (is_array($report)) {
-            $additions += $report['additions'];
-            $updates += $report['updates'];
-            $deletes += $report['deletes'];
-            $skips += $report['skips'];
-            if ($report['skips'] > 0) {
-              $skipped_files[] = $filepath;
-            }
+          $additions += $report['additions'];
+          $updates += $report['updates'];
+          $deletes += $report['deletes'];
+          $skips += $report['skips'];
+          if ($report['skips'] > 0) {
+            $skipped_files[] = $filepath;
           }
         }
       }
diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
index e8f15f6b9e..844fb858b5 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
@@ -70,9 +70,7 @@ public function prepareRow(Row $row) {
     $query->condition('lt.language', $language);
     $query->addField('lt', 'translation');
     $results = $query->execute()->fetchAssoc();
-    // @todo the use of the coalesce operator below is needed to get
-    // migrate tests pass on PHP 7.4.
-    $row->setSourceProperty($other_property . '_translated', $results['translation'] ?? NULL);
+    $row->setSourceProperty($other_property . '_translated', $results['translation']);
 
     parent::prepareRow($row);
   }
diff --git a/core/modules/views/src/Plugin/views/filter/Date.php b/core/modules/views/src/Plugin/views/filter/Date.php
index baa27b70f4..b7d1821bfd 100644
--- a/core/modules/views/src/Plugin/views/filter/Date.php
+++ b/core/modules/views/src/Plugin/views/filter/Date.php
@@ -182,10 +182,7 @@ protected function opBetween($field) {
   }
 
   protected function opSimple($field) {
-    // @todo $this->value['value'] should always be defined, but it's not
-    // and that's leading to test failures in PHP 7.4. Figure out a more
-    // robust solution rather than coalescing to NULL.
-    $value = intval(strtotime($this->value['value'] ?? NULL, 0));
+    $value = intval(strtotime($this->value['value'], 0));
     if (!empty($this->value['type']) && $this->value['type'] == 'offset') {
       // Keep sign.
       $value = '***CURRENT_TIME***' . sprintf('%+d', $value);
diff --git a/core/modules/views/src/Plugin/views/filter/NumericFilter.php b/core/modules/views/src/Plugin/views/filter/NumericFilter.php
index 4f9680ec57..05d0cc8979 100644
--- a/core/modules/views/src/Plugin/views/filter/NumericFilter.php
+++ b/core/modules/views/src/Plugin/views/filter/NumericFilter.php
@@ -354,10 +354,7 @@ protected function opBetween($field) {
   }
 
   protected function opSimple($field) {
-    // @todo $this->value['value'] should always be defined, but it's not
-    // and that's leading to test failures in PHP 7.4. Figure out a more
-    // robust solution rather than coalescing to NULL.
-    $this->query->addWhere($this->options['group'], $field, $this->value['value'] ?? NULL, $this->operator);
+    $this->query->addWhere($this->options['group'], $field, $this->value['value'], $this->operator);
   }
 
   protected function opEmpty($field) {
diff --git a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
index 1788ec63a7..a0bbedf731 100644
--- a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
+++ b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
@@ -263,11 +263,7 @@ public function buildJoin($select_query, $table, $view_query) {
 
     if ($this->leftTable) {
       $left_table = $view_query->getTableInfo($this->leftTable);
-      // @todo $left_table['alias'] should always be defined, but it's not
-      // and that's leading to test failures in PHP 7.4. Figure out a more
-      // robust solution rather than coalescing to NULL.
-      $left_table_alias = $left_table['alias'] ?? NULL;
-      $left_field = "$left_table_alias.$this->leftField";
+      $left_field = "$left_table[alias].$this->leftField";
     }
     else {
       // This can be used if left_field is a formula or something. It should be used only *very* rarely.
@@ -385,11 +381,7 @@ protected function buildExtra($info, &$arguments, $table, SelectInterface $selec
       // Allow the value to be set either with the 'value' element or
       // with 'left_field'.
       if (isset($info['left_field'])) {
-        // @todo $left['alias'] should always be defined, but it's not
-        // and that's leading to test failures in PHP 7.4. Figure out a more
-        // robust solution rather than coalescing to NULL.
-        $left_alias = $left['alias'] ?? NULL;
-        $placeholder_sql = "$left_alias.$info[left_field]";
+        $placeholder_sql = "$left[alias].$info[left_field]";
       }
       else {
         $arguments[$placeholder] = $info['value'];