PookaMustard: The question should not be "How can PC gamers NOT use Steam in 2016?". The question should be "How come Steam is STILL BEING USED by PC gamers in 2016?"
My thought exactly. I'm surprised so many people *do* use steam, or other steam-like services, in an era where consoles have developed to the point that they can provide similar gaming experiences (I'm not a graphics techie or guy who is obsessed with framerates, so don't murder me for that comment pls :) ), AND so many games are now available DRM-free.
PC gaming historically has always been a "DIY" type thing. You sort of took the responsibility yourself to get the games to run on your system. And people have been modding games since before my gaming years, with the idea of "making the game into what you want it to be". And from that standpoint, any service like Steam that adds bloatware to your system and limits or controls your gaming experience goes directly against this whole "DIY" idea.
So I always figure anyone who wants to avoid that "DIY" aspect tends to go the console direction and mostly avoids PC gaming in the 1st place.
And due to that, and the gazillion other reasons other people in this thread mentioned as to why they don't like or use Steam, I actually think DRM-heavy services like this will die out eventually. Call me crazy, but I think GOG is showing us the PC gaming future here, with their biz model, as counterintuitive as that may seem. It seems to me the popularity of GOG has continued to grow in my several years I've been using it, and having some killer AAA titles ilke TW3 and Dying Light (btw which I'm playing from GOG currently and is awesome) released on a DRM-free platform are proving that devs don't *have* to work with Steam or the like. And I think that going forward, there will be fewer and fewer AAA titles that don't have a console version.
And for myself, I'd much rather pick up a relatively cheap console than add a headache-waiting-to-happen like Steam to my PCs. In fact, I just did this, grabbed up a cheap PS3 so I can play Assassins Creed:Black Flag, Borderlands, etc. Having that, the only Steam games that "tempt" me anymore are the several TES-Fallout type games out there that, in my eyes, require some level of modding to become a complete experience.
For the future, I picture gamers diverging, into console players who want games to work easily but accept inflexibility (unable to mod, etc), and PC gamers who want more control of their experiences and are wililng to put the time in to have that. And plenty like me who will do both. In that scenario, sites like GOG and DRM-free games will dominate the PC market, and the console market will continue to grow as well. And Steam and its ilk will be relegated to some niche market of people who want someone to "manage" their games for them on a PC, for whatever reason. (Or better yet, they'll simply die a slow death... Steam that is, not the gamers ;P ).