[eCa]

One factor that sometimes leads to problems in this regard is (as mentioned) backwards compatibility. Pretty much nothing that once has worked can be removed or changed because somewhere mission-critical software depends on it.

Another issue is discoverability. A concrete example is that https://metacpan.org/ is a much better (imho) presentation of cpan than http://search.cpan.org/.

It is the curse of being a very stable language and ecosystem.