Another alternative for your expression might be ‘to do less’ as i steamos doesn’t do less than windows. Or ‘do worse than’. I would say even ‘steamos doesnt under-do windows in terms of gaming’ would work but it sounds more awkward. Mind if i ask what language the expression ‘do under’ is from? Its neat, i like it. English sucks in a lot of ways. Also agree with everything you said about OSes. I had tried linux in the past but mostly stuck to windows for gaming, then i got a steam deck and ill never install windows ever again.