I find it funny that every time other publishers try to recreate Steam with their own catalogues, a good chunk of gamers (myself included) just refuse to buy "exclusives" on other platforms, to the point they eventually crawl back to Steam. EA held out for a LONG time. I broke my reluctance only once because I wanted to play the latest FarCry game, but otherwise, I've kept all my games on Steam. They eventually caved too.
What's also interesting is some games will unlock for you if you buy them from their own stores, like the Elder Scrolls Online MMO will unlock on Steam for you if you just link your Steam account.
My only annoyance with them is with Valve for not making new games / franchises. They clearly have a good talent pool, but they're so much slower than Nintendo it feels like in this regard. They're finally adding a new game, but its just a Team Fortress spiritual successor.