Nim has been trimming stuff out of its stdlib instead of adding them lately. And because of its huge focus on meta-programming almost anything can fit in an external package anyways (even async is a module in Nim, without any specific support in the compiler). The Nim language as such seems to be "complete" as it is now, and I'd say it's quite unlikely to gain bloat in any way that would affect people not using the bloated parts (i.e. the compiler will still stay fast).