No you're not reading what I'm saying. Changes that accumulate over the course of a decade worth of play, not changes that come all at once in a new edition. Like how Call of Cthulhu does things (which @billd91 clarifies better than the way I might have said it).but by that logic they should never have needed to... Honest question, Do you think ANY edition has improved on previous ones? If so you might find it surprising that people who joined in 3e+ would NOT have if thac0 was still a thing... and we don't know what the new Thac0 is until they show us a better way.
You still get change, just not on the radical scale we've been trained to expect in editions of D&D. Because you aren't dumping all of the changes all at once but are rolling them out over time. Editions become a way of incorporating already existing rules into a single rulebook, not a radical rewrite of the game that we all need to learn how to play again.
Also - there are other games out there. If a stable D&D encourages people to go explore other RPGs for things that are radically different that would be a good thing in my book.