And FYI pypi is better than CPAN so all the other stuff in the that post is crap imho. I was a Perl dev for ~10 years. Now have about 5 worth of Python. So thank you.
gems has no idea if any specific gem is already installed, so if you ask it to, it will just install over whatever is there, no matter if it's the same or not.
Additionally it does not automatically run tests and abort if they fail, so the chance of installing a broken gem over your existing working gem is pretty big.
Compare, for example, AnyEvent's documentation with that of Twisted - or any of Perl's standard documentation with that of Ruby.
That somehow fails to convince me that other language ecosystems parallel the CPAN in breadth, scope, maturity, and ecosystem. See CPAN Testers, for example.
