Nah. KDE 3 was better than Gnome 2 in the first place. KDE 5 has almost recovered to that level.
GNOME is an interesting case, because you can't blame it (directly) on managers pushing dark patterns to maximize conversions. Is it all just trickle-down of user-hostile design philosophy from the commercial web?
Gnome 2 famously did this. Gnome 3 famously threw out the findings, which is why Linux Mint exists, and how KDE (eventually) caught up on usability.