From other discussions I’ve seen, the guy stepping down was frustrated by having C code rejected that made lifetime guarantees more explicit. No rust involved. The patch was in service of rust bindings, but there was 0 rust code being reviewed by maintainers.

I’m a mechanical engineer and have spent literal years in front of Creo and SolidWorks. Trying to use FreeCAD felt like flying a Cessna 172 after being accustomed to a business jet; they can ostensibly get you where you need to go, but the cost in effort to use the tool is not worth the cost saved in buying the commercial tool.