MMC snapins haven't been touched in years and still can't even sort those columns properly, search and filtering is terrible
Control panel is still not migrated over to settings after 12 years nor you can open two settings apps.
Error messages in modern apps are just the worst, how about printing valuable error messages than "something is wrong"?
Fixing dark patterns like taking over your screen with popups and taking over the application header so you can't close windows unless you go to the task manager. First time opening edge shows a really annoying splash screen + home page is filled with ads.
Also where are 5 second boot times on NVMe SSDs? Anything more is just sloppy.
Just to list a few pet peeves
But let's see if they can even fix things they've mentioned in the post, though that's like 1/4 of the issues that should be fixed.