Once you choose a package manager, it tends to be easier to always use that, rather than use one-off binary installers. (In fact, the one-off binary installers can lead to known permissions problems when it comes to Homebrew specifically.)
I'm pretty sure that Technomancy is indirectly making a point about Apple's lack of a package manager. Something like this, I'm guessing: http://teddziuba.com/2011/03/osx-unsuitable-web-development.... (the part about package management, that is).
Note for both pro- and anti-Mac folks. I'm simply trying to show how the grandparent post is relevant - why it's here. I'm not stating an opinion one way or the other on anything else.