@dellus :-
Well, as a graphics "hobbyist" of something like 40 years standing, I tend to experiment & 'play' with a lot of stuff.....including a full version of Photoshop CS2 running under WINE. I actually purchased this nearly 20 years ago; as luck would have it, it's the last version of Photoshop that's pretty near fully-functional under WINE. Subsequent versions have all kinds of issues, and don't really behave themselves at all.
I did a 2-year technical drawing course at college back in the mid-70s, and have always liked playing-around with CAD software ever since.....but I don't do it to any serious degree, so lack of various formats doesn't really bother me.
Yes, I do produce a number of self-contained portables, it's true. Mostly, these create the .config files within the portable's directory, then sym-link them out to where the app in question expects to find them when it runs. At close, the sym-links are then removed again.....and because they're sym-links, any config/cache stuff is at all times being written directly back to the portable anyway. If you run them from a flash drive, you can 'share' them between multiple machines, and you've always got your own personal settings ready-to-go.
All very much inspired by the creations from PortableApps.com ..!
I switched to using a whole raft of these things during my last year or so with XP, and had wanted to re-create them in Linux ever since..... Most use either an AppImage (no, an AppImage is not truly 'portable', because they leave .config files all over the place, "ready for next time". Why create multiple copies of the same thing?), or as in many cases, it'll be an app like Blender where the whole thing runs from a single self-contained directory.....just like 'zilla-based browsers do.
AppImages are my favourite 'portable' format.....when they're built correctly. Too many 'packagers' simply make bad AppImages out of existing .deb packages, meaning instead of being truly self-contained they're STILL hunting around all over the system to find dependencies. And that kinda defeats the whole object of the things..!
My 'portables', especially when based around an AppImage, attempt to address this business of leaving files all over the place. It's my one big niggle with the things; otherwise, it's a brilliant concept.
Are you 'hinting' that you'd like the LibreCAD AppImage turned into a 'true' portable?
Mike.