but instead to the deceptively difficult problem domain.

It's definitely a big part of it, but I think sometimes it is a Rust thing. Of course, motivated by the essential complexity, but accidental complexity is still complexity. I don't think or hope it's an existential issue for Rust, which is good. The sharp edges around pointer-reference nuances in unsafe, for instance, are being addressed by things like raw references (mentioned upthread). I think languages that explore this problem domain more might provide interesting alternative designs for what Rust handles through unsafe.