C used to have a close to bare metal semantics, and on some environments¹ still have it. So if you need low level semantics, it normally beats assembly on those environments.

The Rust people are working hard to support everything that C does, so in the future C and asm will probably not have a monopoly there. But this is still not our reality.

1 - Of course, not a PC software stack, and not on any ARM available today.