npm is not built into v8. Composer is not built into php. Maven is not built into Java. Cabal is not built into Haskell. And all these tools benefit from being able to have their own release cycle, decoupled from the parent language.

If anything, the problem with Python is that it does have built in packaging tools - which inevitably became outdated, and just as inevitably remained in the standard library, aka the place where modules go to die. Everyone agreed that the standard tools were terrible, but because they were standard they hung on much longer than they should have.