As I pointed here originally, you need to be very careful about what you ADD to a language, because once the cat is out of the bag there is no going back, people are going to use that stuff. That's why I dont begrudge the attitude of the golang maintainers to be very slow in introducing stuff, because it is basically an irreversible step.

I suppose every thing in Rust has a raison d'etre but you pay with complexity that versatility. I think there is space now for a modern, memory-safe, SIMPLE, systems programming language. C has the backwards compatibility problem (although I am still bullish on its future) and a language like Zig never got any traction. Hopefully the future will bring new, interesting stuff.