> open source and hobbiests do not design good products

This is opinion. In my opinion, closed products are not good products. To me, openness and freedom trump subjectively better UX any day.

> as much as they enjoy self-righteously declaring their values.

Consider that in our society and software ecosystem, this is all but required to stave off the forces that would enclose the software commons that these "self-righteous" volunteers work so hard to maintain.