Microsoft attempted to address this with Windows 8, but by forcing touch interface styling to a desktop user they created a massive flop. Adding Windows Mobile trying to do it's own thing in 2015, and failing to gain market share by not investing enough early enough, and they were solidly outclassed. If they had hot the right points, we might have seen smooth Mobile Microsoft gaming 10 years ago.
What might be the real killer feature of SteamOS is the ability to run a Linux desktop. For $400 one can have both a mobile gaming console that can dock with their television and also dock with a traditional PC for other traditional uses.