The big difference is that with any of the Windows toolkits, an application written on their heyday will keep working today, good luck doing the same with any Linux toolkit.
Also only Qt is comparable in the full stack experience offered by Windows frameworks (and MacOS/Android/iOS/...), with the caveat it is anyway cross platform and not Linux specific.
With Gtk and their HIG most stuff looks decent and usable. Windows? Nobody cares about the HIG. Micrsoft provides more toolkits than I know. And a lot developers just do whatever they want on Windows. Or worse, they use Electron. Microsoft Teams is the worst "application" in this regard.
By the way:
https://gitlab.gnome.org/GNOME/gtk/-/issues/3787
The font rendering issue. I recommend ignoring the blaming (users) and ignoring (developers) on both sides and instead reading the details involved. Looks like mostly intended and used during development on HiDPI-Displays and they need people experienced in font drawing matters. Some fixes are landing already. Taking into account how much effort was put in Harfbuzz, Freetype, Pango and Cairo I think they can only learn from this - being more careful and keeping backward compatible solutions alongside until the new stuff is working fine for all.