IF RCS and actually making siri not suck are the features to make it the "biggest" update in history, that is pretty weak. Not to mention can't wait for all the bugs since IOS17 was supposed to be a bug fixer/squasher update and the bugs are still through the roof.
One rumor I heard was that it will have a form of fraud or malicious trolling finder, as I understood it. Tell you if this person you are texting with is doing some fishy activity.