I was just speaking from experience and asking how the data accounts for non de setups. I have never liked qt, and always preferred gtk, having been from openbox to hyprland and now sway. I currently use gtk, and all my apps are based on gtk and they don’t draw their own decorations for me. I find gtk integrates really well with my setup and every time I have tried qt I have found it a mess and it never feels cohesive.
My point though is not to say gtk is better than qt, as it’s not, and vice versa, but just to try to highlight the fact that just because KDE is the most popular de, doesn’t mean qt is the most used toolkit compared to gtk. I bet they are fairly evenly split.
Ah ok, I didn’t realise someone would run a wm or compositor and not bother with gtk or qt. I hadn’t come across that before. Guessing there is no real way to get numbers who use that setup?