That being said, this is really cool, and brings back a lot of memories.
Otherwise is it a great DE. It is good looking and runs extremely smooth and I prefer it to macos and windows 11 every day of the week.
KDE on the other hand, for some reason feels to me like going back to windows 98.
...which tbh is a good thing, because the Windows desktop of that time was pretty much the peak of the desktop UI paradigm, with actual research going into the UX instead of 'whims and vibes' like today (I would pick Win2k though since it had a much more solid technological foundation than Win95/98).
KDE has found its own way since it was a mere Windows desktop copy though (e.g. it's much better now - even more visually consistent - than both modern Windows and macOS). But unlike GNOME, KDE never abandondend what made it great.
Nostalgia of old out of touch PC users(of which I am one; old I mean, not out of touch ;-)).
I doubt people under 25 years old today have the same attraction to desktop UIs from before they were born and think that's the ideal usability goal for daily driving today.
Age has nothing to do with it. Gnome 3 is just bad.
It's great.
I do really appreciate Klassik here though in general. There's so much nostalgia work for recreating or preserving various old systems. It's a noble tribute to see classic linux desktops also paid that honor.