IMO Gtk4 (the one being wrapped) is terrible even on Linux :-P. Gtk peaked at Gtk2 and Gtk3 is passable with the right theme but i can't say i liked any Gtk4 program i've seen (fortunately Gtk4 doesn't seem to have much of an uptake so far).
Its not like you have a choice to run them with a non Gtk4 UI anyway
Bottles has PlayOnLinux or Lutris. I'm not familiar enough with the Linux audio landscape to know any Easy Effects alternatives for it off the top of my head. Nobody's locked into anything or being forced into GTK4. Heck, Celluloid is just straight up a wrapper around MPV.
Might be that i also avoid flathub, but i haven't seen much use of Gtk4 in the applications i use myself.
> think they are some of the best looking apps available on Linux.
Ok, thanks for the information but i think otherwise, i dislike how Gtk4 looks. TBH i also think Gtk3 looks bad but i've got a theme for that. Perhaps i might find a decent Gtk4 theme too.