I've been writing JS for 17 (continuous) years I'd say it took me at the very least 6, probably much closer to 10, to get to what I'd call "expert" JS knowledge (and have since regressed somewhat).

I've been using other languages longer than 10 years too but not continuously enough to ever consider myself expert.

I'd say there are definitely rust experts out there, but I'd posit it's unlikely for the average dev to have gotten that far yet.

The current Rust experts probably spent more than 10 years learning the concepts that made them Rust experts.

I cannot disagree with that.

There are dozens of us, dozens! (I started learning Rust ten and a half years ago. Anyway I agree with your point it's just amusing.)