Yea, the question really is will the OSS tool survive long enough to have the UX fixed. In Blender's case, yes, but that's not been true for many other OSS projects. Just look at how many dead electron projects are floating around the internet.
Arguably it's more important to create software that solves a problem first so there is an incentive for people to keep using it. But the less people use it, the longer it will take for the UX to improve organically (see Blender and Inkscape).
Arguably it's more important to create software that solves a problem first so there is an incentive for people to keep using it. But the less people use it, the longer it will take for the UX to improve organically (see Blender and Inkscape).