It does but it's rather unfortunate that the only choice we have when it comes to DEs is either GNOME, which is built by a group of arrogant developers who think there is no downstream for GNOME and GTK, and KDE, which has technical issues that prevent widespread adoption.
Which KDE technical issues are preventing its adoption? I'm running KDE full for a long time and encountered no issues.
IMHO, the lack of KDE adoption is the inertia of GNOME adoption by the major distros combined with the inertia of hate over KDE with the stereotype that "it's bloated" which hasn't really been the case in the last versions of Plasma.
Some of them are linked by pxc post above mine.
There's also the issue that Qt apps can only be written in C++, a language that many don't want anything to do with. In comparison, GTK has bindings for a variety of languages including Rust.
Are those good bindings , or auto-generated or outdated ones ? I did not checked in a long time but I think only Python had decent bindings. I would avoid non-official bindings, those are most of the time garbage and you waste your time instead of focusing on your work.
I seen Qt in a lot of proprietary applications, including launchers for video games (the app that will let you setup a game configuration before launch) - I was surprised why a Windows only video game would not use the Windows APi directly, but it is obvious that Qt is better then whatever Windows has this days for c++ devs and game devs are not afraid of a bit of c++ or have some irrational disgust for Qt pre-procesor (I see this excuse all the time, we don't switch from GTK to Qt because of the qmake/moc I honestly prefer an honest explanation)