Earlier quoted context omitted.
KDE or plasma whatever its name, is basically unchanged from 1995 UI philosophy. The closest we can have today in 2019.
I run XFCE (via Xubuntu) on my home desktop for the same reason. The lightness is a bonus.
Or at least https://www.forbes.com/sites/jasonevangelho/2019/10/23/bold-... has been making the rounds.