But the most popular messaging app on iOS, Messages, has never implemented “Mark as Unread” even though users have been clamoring for it for years and it’s been rumored that they tested it. What’s even wilder is that iMessage doesn’t have any other in-app way for the user to signal that they need to return to a message in order to respond to it… More here.
Apple Messages is just about perfect if you ask me, but I like so many others do not understand the lack of unread abilities. There have been so many times when it would have been extremely useful. Come on Apple, sort it out.