It definitely doesn't fit as a hardcore number crunching language. People do regularly just setup their number-y code in C or similar and call out to it so you can handle the distributed stuff with a language that works well there and the low level stuff with a different one. Similar to numpy/etc. calling to C or FORTRAN libs.

> making it too much of a niche language.

No language will be the "one true language" that excels at everything.