I think both you and the parent are correct. I don't think there is one answer to this question for both languages. I do think the right answer for Rust is to

I think both you and the parent are correct. I don't think there is one answer to this question for both languages. I do think the right answer for Rust is to "wait and see." Let libraries organically develop, and wait to pull them in at the right time, to, for lack of a better word, die.