I'm not sure I understand your point. It seems you're implying (please correct me if I'm wrong) that ecosystems of modern open-source languages are more local, more tightly coupled and having people working in concert towards a common goal.

In my experience this is often what happens when a new community is spawned. E.g. when nodejs started it was there was always one single implementation of that thing I needed and it was reasonably up to date with the rest of the things around it (including the runtime environment, of which there was only one or perhaps two mayor versions of). As time went on more people started to contributing, often with different levels of commitment.

Often "modern" gets conflated with "young". Almost by definition, young communities don't develop the same kind of problems of mature communities, yet.