It’s not churn its change, and it’s inevitable. No sense getting worked up over it.
The only improvement I've seen has been for mac they have the command+space launcher which is functionally like the win+type the app you want. Graphical file browsers haven't changed since the original Mac and/or Win 3.1. Mac has never had a good tree view IMO but they do have a version of it.
The only reason UIs would change at this point is to keep UI/UX folks employed and busy, and give the marketing department something new to talk about.