You are conflating simplification of a DE experience for modern hardware, that is still fully customizable through extensions with dumbing down, which is the abelism part, and it's she
Also, if you really wanna get into it, the workspaces and window management system of vanilla gnome out of the box is more sophisticated, especially for mouse or touch screen than default KDE
I used it for many years. Every single release for the past few years removed powerful features in the core system utils, like the file explorer. Use gnome long enough, and they'll remove features you like, too