This isn't my first run around the internet, I know it won't be any different, the benefit comes in exposure to a larger customer base.

You could find the debate here already: http://www.gamesas.com/topic/1490799-steam/#entry23401369

It's better for them to release it into steam when the game has a successful release so they could pull more audience.

I use steam for almost all my games. I don't understand your attitude. Anyways, steam is mainly a PC/Linux platform.Feel free to correct me if I'm wrong, but UPlay connectivity spans across many platforms including ones that ESO will be involved with " The service is provided across various platforms (PC, Mac, PlayStation 3, Xbox 360, Facebook, iOS, Android, and most recently revealed, OnLive). The Uplay app for the Wii U was released after the launch of the console^{http://en.wikipedia.org/wiki/Uplay#cite_note-1} on 1 December 2012 on the Nintendo eShop."

See above.