Culture is maintained and changed by repetition. That's why "household name" companies still advertise.
Every new wave to Mastodon brings at least one "this is too important to CW" person. People are going to keep bringing their bad habits and conceits from other places.
Cede no ground to them until they get why we do how we do. We have a good culture here. Don't let the ones we left ruin it. Change is good. Reversion to mainstream status quo is not.