You must also take account that people not always look at a language per by their MOST perfect domain fit.

For me, and probably many I look in the rust sphere(and go and swift and F# where I also have worked), this langs are not picked because "I need bare-metal baby!" but "I need something a bit faster/easier to deploy/less resource/less crazy intensive than obj-c/python/ruby/js/php".

I have picked all 4 (rust, f#, go and swift) because that, because all (except go) have AGDTs and pattern matching (and go only because I need some utilities easier to cross compile FAST) and that is all.

ALSO

because are langs FRIENDLY to solo(me!)/small teams of developers. Even If i must pick a "system language" I will NEVER pick C++, too much complexity. That is why I pick F# vs C# (F# is more economic in lines of code, more expressive and overall simpler), Swift as fast I as could (vs obj-c) and Pascal over C/C++ in the old days.

Looking this way, them intersect much more than most imagine.