Comment by 4bpp

I don't think that is a correct interpretation. As I understand it, Linux does not have a notion of someone being obliged to help facilitate a patch, especially if it's not the narrow case of a maintainer and a patch to the subsystem they are in charge of. What do you do if you are a C developer modifying system A, your change has implications for system B which includes Rust code, and none of the Rust developers involved with B care to volunteer time to draft the necessary changes to Rust code for you?

The same situation of course also arises between C-only subsystems, but then the natural solution is that you have to go and understand system B well enough yourself that you can make the necessary changes to it and submit them as part of your patch. In that situation you are "forced to use C", but that's a free square because you are always forced to use C to contribute to Linux code.