Baseless hate with no evidence. Linux DE's are perfectly working and great Gnome 3 has tons of extensions to tune it to your needs if you do not like the Ubuntu default. KDE can be a bit buggy if you run cutting edge (what a surprise), better not run a rolling release like SUSE Tumbleweed with it.

I run Linux DEs for about 10 years now, always came back to Ubuntu. KDE offers a lot of stuff that I personally do not need.

Running Gnome 3 with Dash To Panel, taskbar on top and Tiling Assistant that give a Win 10 like helper to split windows.

Previously used Material Shell, awesome but buggy. The creator works on a new thing in Rust, it will be awesome!