[Performance] Load only relevant states in WorkflowItem::getAllowedValues()

I noticed that the WorkflowItem::getAllowedValues()method in workflow field module loads a large amount of objects, (apparently) without a good reason, slowing down the page execution. On a system with some workflows and a large amount of states/transitions this can cause performance issues

public function getAllowedValues() {
  // Get all state names, including inactive states.
  $options = workflow_get_workflow_state_names(0, $grouped = FALSE, $all = TRUE);
  return $options;
}

the above code load ALL the Workflow entities, ALL the WorkflowState entities and ALL the WorkflowConfigTransition entities present on the system for provide the allowed values for a single workflow field (which of course can be associated with only one Workflow).
The method docblock states: It contains all possible values, because the result is cached, and used for all nodes on a page.; but since the allowed values are statically cached on a field basis and a field can be associated with only one Workflow there is no need to load all these objects... I'm missing something?

Thanks!