Agree, after I thought for more examples. Thanks, don't know why others downvote.
Besides consolidation point, I still think that "barrier to entry" point is still valid -- if it's more effort to even publish a library, its author is probably more committed already.
That's still consolidation, and it also needs time.
Even in Rust crates like hashbrown or parkinglot have been basically subsumed in the standard library.