As someone who lived through the "eternal september" when AOL opened the doors to usenet, I'm seeing some of the same dynamics play out here of the folks who were here getting angry at all the new entrants, mainly for breaking norms or criticizing decisions that felt settled.
My one recommendation: recognize that new people also have things to add and different perspectives can be useful.
Norms change. It's good to explain why decisions were made, but not to scold.