Just look, for instance, at FPGAs: almost all the tooling is proprietary, very expensive, and very buggy too. Or look at PCB design: Altium seems to be the standard here still, despite Kicad having made huge advances and by most accounts being as good or even better. It took decades (Kicad started in 1992) for the FOSS alternatives here to really catch on much, and only really because PCBs became cheap enough for hobbyists to design and construct their own (mainly because of Chinese PCB companies), and because CERN contributed some resources.
I'm not sure what the deal is with engineers hating collaboratively-developed and freely-available software, but it's a real thing in my experience. It's like someone told them that FOSS is "socialism" and they just reflexively dismiss or hate it.
But then a friend reminded me of the Fusion 360 hobbyist plans, and I decided to give it a try, just to see. It blew my socks off! It's just a lot more refined. The first 12 minute tutorial took me further than I'd gone in the ~2 hours I did with Ondsel.
FreeCAD is an amazing piece of software to be available for free. But in the end Fusion just operated a little more smoothly in lots of little ways. I have really limited time to do 3D modeling, so it's pretty valuable to me to get more done quickly.
One temporary thing that's making FreeCAD a bit hard to get started with is that there's not much content out there for learning 1.0, and sifting through out of date content to find it took some work. That'll improve as time goes on.