That's not the problem. (*) The actual problem is that the distro maintainers want split packages (for security and so on), not vendored, and this requirement was already burdensome for many languages other than C/C++. If vendored packages were acceptable I believe people would have of course contributed them. Maintainers made this obstacle themselves (for a good cause, arguably) and it seems farfetched for them to then complain other languages are uncooperative.

* Was "isn't that a problem?", which was not I meant to say.