CoC, bad compiler, bad type system, no formal proofing whatsoever, some of documentation reads like someone who knows English as a second or third or fourth language wrote it, in some cases it's just plain wrong.

Elixir has already taken most of the ruby mindshare, the crystal team really isn't hacking it when it comes to presenting why crystal should be used instead of ruby except for speed. That its faster is the only viable motivation currently.

I don't know anything about nim, so I can't really compare it. I wrote some compiler plugins and utilities for crystal at my company, but I ended just rewriting the component in ruby, and it runs hourly with JRuby.

I hope Ruby3 gets optional types a la Dart, and a code conversion tool. Those two things would revive the entire ruby universe.

Edit: last time I touched crystal was 6-7 months ago, but I doubt anything has changed.

Edit edit: not an elixir fanboy. It sucks too, but at least it compiles down to BEAM so if I'm writing erlang I don't have to actually touch it as long as it works.

The elixir astroturfing is out of control lately. It's cool, it ain't THAT cool.