Maven is built on Plexus. This lightweight container is used (afaik) for :

Let's now consider the today responses to the same requirements. Maybe Plexus was a very advanced container when it was created, but it did not become the today 1rst choice technology :

Considering an opensource tool like maven is built by volunteers developers, it would be a good thing to attract talentuous ones to use up-to-date and well known technologies. Maven beeing based on some near-perfect tools that fiew developers know is not a good think, as we need support from a wide community to improve it.