Desktop "progress" is now sadly now mostly done by Microsoft (geriatric at best) and Apple (mostly just implementing the new graphical design whims every year).
By all means make cool stuff but also make it opt in.
Things I need my OS to do are: run my apps (office/browser/games), connect my devices (printers/game controllers/displays), basic file operations (copy/paste/delete)
And while doing this be: secure, reliable, out of my way.
All these adding people/chat/weather widgets "innovations" (looking at you, msft) make me throw my hand up in the air and ask "why", I wish they would spend that time and energy on security and reliability instead.
Plasma 5 is great and ages like good wine. The interface does not change much, but receives big improvements each version that don't break habits. Focus is on fixing usability bugs. See the weekly posts at [1] for instance.
It gets refined instead of changed.
Microsoft and Apple both are stuck comparingly both running the same Windows 95 approach for all their desktops since.
Yet ~15 years later here we are.