Well they may work in some way but you'll see degraded functionality. I don't think it's hyperbole, every X window manager and panel, dock, etc that I've seen h

Well they may work in some way but you'll see degraded functionality. I don't think it's hyperbole, every X window manager and panel, dock, etc that I've seen has support for a seemingly random jumble of motif and EWMH hints, and rarely will they support all of them. If you're using the standard Xresources then those might sometimes work in other apps, like Tcl/Tk and maybe FLTK I think supports it, but other things, not so much. And if you want good high DPI support with those apps then forget it. I cannot remember what the Raspberry Pi default desktop looks or acts like as I haven't used that in forever, sorry. All I remember is not liking it for other reasons, i.e. the DRM/KMS driver performance was too poor to be able to handle a compositor or play a 1080p video. But maybe that has changed recently?