Because there was some huge breakthrough since eliminating threading issues?

(If you answer just use Erlang, CSP or any other variation, well, my point exactly).

The only breakthrough is that some of us learned to use threads. Apparently some of us didn’t.

Apparently, after decades of CS and tons of costly errors, some of us still haven't learned than issues like memory safety, race conditions, etc are either handled at the language level, or are dangerous for everybody -- and that those that consider themselves immune to them because they "know how to use them" and are "better programmers" are just deluded.