OMG, Gajim 2.x for Windows is unusable! And mainly because of GTK4 — it doesn't respect system scaling and its own setting only goes up to 1.5x — everything is tiny! I can partially work this around with font setting in theming options, it works for chat logs, but not the contact list and other UI elements.
But what's even worse, GTK4 doesn't support Windows' rudimentary "tiling" window management features — it doesn't stick to screen edges, at all! You have to resize the window manually like in the old days.
I'm not making this up: https://dev.gajim.org/gajim/gajim/-/issues/12348
And corresponding GTK feature merge request is from 2021 (!): https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/4252

Oh, and there is no main application menu — no button for it and no keyboard shortcut to make it visible, it's just gone! How do I browse services? How do I do anything at all, for which the main window has no button?
If I wasn't aware that 1.9.5 exists, I'd consider this port an early beta.

Losing to Qt as cross-platform UI toolkit makes sense like never before — even the few applications still relying on it, become impossible to use on switching to newer GTK version 😩