Although usually more visually consistent than QML, it's not very advanced.
Although impressively visually consistent and aesthetically pleasant, GTK software is always less functional/advanced than Qt software due to how it does not allow complex interfaces.
Additionally, custom system-wide user/OS-defined colouration is unnecessarily difficult from GTK4 onward due to no support for it, and client-side decoration becoming mandatory. This causes unnecessary inconsistency.
However, most importantly and problematically, GTK software is rarely ported to OSes other than desktop Linux, whereas Qt is available via convergent toolkits such as Kirigami, which supports Windows, Android, and Linux, in any form-factor.








