[hardwaresofton]

After having written a few of them at this point at $DAYJOB and on my own... They're actually not so bad at all -- it's quite nice the world that they open up.

I'd venture to say most people are mostly annoyed at the overuse of macros (where a simple function would do).

Rust's attribute system is something it REALLY got right -- stuff like #[cfg(test)] and the conditional compilation stuff is really really impressive. Not sure what cross platform dev looks like in Swift but the bar is quite high in Rust land.