Maybe it's because Rust is new and well designed. People who have adopted it probably care about this and want to maintain it and that's hard. Maybe it's my perfectionism, my desire to build and live in an ivory tower, but I feel this as a Rust user, a fear that they might break some perceived perfection that I care about. I've commented before that "at least C++ developers are free from the burden of using a perfect language", which was me projecting this feeling.
Rust is far from "perfect" in my opinion as any other language. It tackles couple of particular and important problems but since it can not completely solve it for general case it bends people to think in a certain "perfect" way. Not sure it is ok when one has to jump hoops on what should be perfectly valid and logical code just because compiler can't figure out that it is actually safe.
Also as a generic tool I think it ought to support multiple paradigms and it does not. Just because they (language designers) believe that doing thing their way is superior to what others might find more appropriate does not make them right.
Personally - I would use Rust if clients insists which so far has never been the case, otherwise I would take a subset of C++ any time over.
