If I were a maintainer in that position I’d be barring the doors too. It’s not a driver for some esoteric realtek wireless card or something.

This effectively kills R4L. If they can't include Rust Interfaces for important subsystems, each driver written in Rust that uses these subsystems has to separately track all the Subsystem Interfaces, leading to lots of extra work for no benefit.

If this is the approach Linux takes, they should just cancel R4L completely.