Voting starts in March for the Drupal Association Board election.
I noticed that due to $controller->form_state the form state gets serialized *into itself* when it is cached. I've discussed that with plach and we agreed to remove $controller->form_state for now and just pass it on to respective methods always. We may want to simplify the getEntity() calls to do not require the passed on form-state again in the follow-up where we fix the controller being still duplicated to $form and $form_state.
To be completed.