Condition chaining is non-standard.

I feel responsible for fixing my mistakes.

We ( ahem I think I mean me mostly ) have been using a ham fisted way of adding conditions!

Here is an example of a line that can be simplified ...
FlagService::getFlaggings()

    // The user is supplied but the flag is not.
    if (!empty($account) && empty($flag)) {
       -$query = $query->condition('uid', $account->id());
       +$query->condition('uid', $account->id());
    }

I think this fixes all of them.