They need to stop messing with things that work. Feature creep is how Windows XP turned into the dumpster fire it is today. Does the interface have a working file explorer? Does it support add-ons? Does it have a file search? You're done.
Not at all. OS should just be core functionality, all bells and whistles should be add-ons so they can be added, replaced, or done without if not needed.
That really depends on where you draw the line on what is "core functionality". I'd consider a system tray to be core functionality, you apparently don't.
No feature creep is how we got the shit that was Windows XP. It is so weird to me that people look back fondly at the OS that pushed me out of liking windows at all.
Friendly reminder: before people liked XP, people hated XP. Much of the criticism that applied to Vista at launch also applied to XP. Guess which one is looked back at more fondly.
And I actually thought Vista was good. Leagues better than XP even. It served me well for 3 years. Now I don't even use Windows anymore.