Individual developer convenience takes priority early in projects like this, in lieu of actually thinking about the consequences of the design. It was convenient to have package management in the compiler, it meant the developers didn’t have to think about things outside their own scope - but as the language and its tooling gets wider adoption these personally-beneficial features become liabilities to adoption.
It happens in many projects .. devs will just ‘do something convenient so they dont have to do the work to do it properly’ and then that just becomes the convention, because nobody else wants to do hard work to do things properly, either.