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.
I think if there were good quality open source equivalents they would be considered, but they pose a huge risk, possibly even an existential risk, if they derail our development plans unexpectedly. Paying a lot of money for seriously good quality tools reduces that risk dramatically.
I've had a brief look at FreeCAD, and it's got a lot of potential. But when you compare it with SolidWorks, OnShape or SolidEdge, there's clearly a huge gap in usability and capability which needs closing before a lot of people will be able to consider it seriously. I'm sure it will eventually get there, like KiCAD did, but it will take many years and a lot of investment to get the usability, polish and featureset up to parity. It looks like Ondsel did a really good job to make some progress along that path.
Also notice that all compilers for scenarios where liability is actually imposed, like in physical goods, most compilers are closed source, proprietary, and certified.