which at least one person said was removed deliberately so as not to overload them - so presumably by their own consent and likely even request
Presumably being the key word here. It's not clear based on this comment. It might have been a Lemmyverse decision to remove all of the .ml communities because they disagreed with the instance admins political stances.
Thanks, I just noticed lemm.ee, lemmy.zip, lemmy.ca etc. missing too, so definitely a 19.4 issue.
Strong agree.