I think the biggest business impact might be behind-the-scenes negotiations with Microsoft.
Of course, this is a seed that might bare more profitable fruit in the future.
If so, that's probably the thing to compare it against. :)
They did recently release "PlayStation Portal" which has the form factor of a portable gaming unit, but its not really a portable gaming console, its a portable hardware streaming client for PS5 games.
If Microsoft pulls some radical move, Valve will be in a better position to react than having to start from scratch.
They would have an edge if they would actually be pushing for native GNU/Linux games, as it is, it is just like OS/2 runs Windows better than Windows, kind of thing.
Just wait until the other SteamDeck competitors get more market share, all of them running Windows.
The game using a PE or ELF for its binary is irrelevant, what matters is the game actually running. There was a fringe loud minority that went all "No Tux No Bux" a few years ago but nobody really cares about that anymore.
> it is just like OS/2 runs Windows better than Windows, kind of thing.
This is a myth, OS/2 was only able to run 16bit Windows software and that was when 32bit Windows software - which OS/2 was unable to run - was starting to become relevant. In addition OS/2 wasn't even able to run 16bit Windows software as good as real Windows as there were various small incompatibilities (e.g. try running Delphi 1 on it and see all the visual gliches). And finally OS/2's (in)compatibility with Windows was among the smaller of its issues - more important was the lack of hardware support at a time when 3rd party "PC compatible" hardware was the majority of PCs and lack of support by IBM themselves (the story mentioning how IBM saw OS/2 as an accessory to their mainframe business has been posted a few times over the years here).
And let's not forget the anticompetitive licensing scheme Microsoft had for their OSes that practically forced people to get DOS/Windows unless they explicitly asked for something different (that would end up more expensive).
Lets see how the SteamDeck will stand against a market flooded with Windows handelds, Game Pass and GeForce Now, from 2024 onwards.