Re: Forget the geeky stuff, sort out the user experience.
Which GUI? It has two. Both are better than later versions of PSP than 7 when you learn them, not hard. Both are FAR better than the latest Firefox or Windows 10 desktop. Or MS Ribbon / Word.
The GUI is daunting if you are used to something else. I pick the All in One window and customise. Some Photoshop users with two or three screens might like the default multiwindow.
In either case, actually using it and configuring it is rewarding. Unlike Win 10 where all than can be changed is colour schemes or Firefox where you need 52 ESR and Classic Theme restorer.
Really it's just a bit different and productive once you figured where the various parts are and how to configure.