In my opinion, the Rust core team - having evolved from Mozilla - is - just like Mozilla - more interested in social issues than in technology. That's actually sad, because what Rust would need is meritocracy.
I don't know, I think having tech groups that are more interested in social issues than the technology itself is a good thing. Way, waaaay too many tech folks keep unleashing hell on the world because they don't care to consider the impacts of what they make or do.
Mozilla's issue really seems to be more one of conflict of interest. They need funding, and the only way they seem to be able to reliably get it is to be and remain compromised.