Thank you very much @123sg 
Great being here!
I tried to install ART (RT fork), but having difficulties with “mimalloc” dependency, need to clone it from github, and I’m not an expert.
Installed DT now, had to install “snap” for that, which I also didn’t like (to mess with the system… potentially unsecured repositories, etc) but I did it anyway, and configured the “desktop” file so it’s running ok.
First impression from DT : It feels “anemic”, and I have some “block” from farther trying it. Maybe later.
On another too old and slow computer I have Adobe Creative Suite, so I want maybe to explore also the options mentioned here:
EDIT: I DON’T LIKE DARKTABLE: I find it hard to navigate (at least on laptop, maybe for larger screens it’s better), mouse scroll in menus was a bad experience, feels “clunky” for me, and also heavy on my system. I want to try ART, and I guess I’ll just have to ditch editing XMP and other files that won’t open in RT/ART.