Not sure about FreeCAD but got a lot done with Gimp, Inkscape and LibreOffice in my personal projects. Totally worth my time!

Me too. I guess a majority of people don't have the patience to work around counterintuitive things nor do they want to take measures to avoid bugs. On the other hand, Blender and Krita seem to give UX a higher priority, so they're more likely to catch on.