My coworkers ask for help with a #Rust compiler error... once...
...and then I run and try to mechanize my explanation and put it back in the compiler.
Our dev tools need to talk to humans in the way humans talk. Nobody is an expert on everything, helping newcomers (with better tools, better docs, better errors) helps everyone.
That's really the trick behind the rustc diagnostic output: it's not about a technology, its an attitude.