Comment by Telaneo

The fragmentation ain't great, but it's mostly just a hump at the start. Once you pick something, it's usually fine, and if it isn't, you learn that fairly quickly and switch to something else that is fine. After having tried one thing, you will have learned what needs you have and can rule out alternatives a lot more easily. Still, it would be nice to have one obvious solid choice, and then alternatives if you have specific needs.

I'd imagine most people are waiting for SteamOS to become that one obvious solid choice, but Valve probably don't want to do that without Nvidia support not being the way it is today (and they probably don't want to do support either way, so they might never do it either way).