Who the hell uses homebrew to install Perl? OS X ships with it, and perlbrew is a much more natural way to install it if you care about not using the system Perl. Maybe it's a dep for another package?
Also, Perlbrew is not necessarily easier, simply because having one package manager manage your packages is better than having many package managers (cargo, npm, gem, etc). It suggests that maybe there should be a package manager for all these package managers... I'd personally want to use the simplest way possible to install something unless I had a reason.