If you have the exact hardware supported by the SteamOS then you’ll be fine. However, I don’t even know of they support nvidia video cards yet, I believe most of their stack is optimized for AMD cards.

In that sense, installing a more generalist linux distribution will net you a better driver compatibility.

Linux gaming is at a fantastic state right now, you install steam and games work. 20 years ago I would have never believed it to be possible.