I agree that we should know how to tinker or slightly modify files as well but I'd say pulling out a separate software with a huge learning curve is a step that's hard to get people to swallow.

I think I really wanted to put emphasis on have to learn it, cause for things that feel simple to suddenly find it will take 30 hours of study and then several additional hours of fixing suddenly feels like a jump up in ask for making sure you can actually print a part successfully that's been posted in a 3D printer file site.

I had experience with simple tools but they don't seem to exist much anymore and the tools in the slicer software seem to exist to say they do which brings me back to the question of if I was missing something or had to learn a separate software.

But some of us aren't professional software engineers. And modifying something turns into a bigger project.

TinkerCAD seems to be a popular answer and I hope simple enough cause I'd love to see stuff I helped design reality but not making money on it too means time needs to be spent keeping myself alive first and thus extended hobby space much further down.