Earlier quoted context omitted.
> But this time it's worse because the APIs are DE/Toolkit specific without the standardization that X11 offered. On this one: It's not really that different. Very little if any KDE code made any direct calls to Xlib or xcb past the very early years. Most of this was also hidden by Qt abstractions, and toward app/shell devs most certainly by further KDE library abstractions. Directly interacting with X11 was an almos…
> Most of this was also hidden by Qt abstractions, and toward app/shell devs most certainly by further KDE library abstractions. Directly interacting with X11 was an almost-never occurence. How do you think Qt draws on the screen ?
Right, but Qt abstracts that interaction so KDE code doesn't have to care about it. The person you're replying to never implied X11 wasn't involved, just that it was abstracted away.