Free, apparently, trumps everything else which is nonsense in my opinion. When something is bad, it's bad and price or lack thereof, has nothing to do with it.
There are certainly quite a few people in the OpenSource/FOSS world who believe paying for software is a heresy.
Personally I'm perfectly happy to pay for software that's good for me and I'll make donations for free-beer software and to things like Wikipedia.
Some of that "good for me", though, is related to familiarity. There are many people who love BiaB's note entry system, but I can't get my head around it at all. I find it unusable. That's probably just me.
For me, MuseScore works because I can do most of the heavy lifting without having to touch the mouse. Mice cause wrist strain and I've suffered with that for many years as a consequence. Horses for courses. YMMV.