There isn't much they can do to foster native Linux support beyond trying to increase the number of people gaming on Linux. It's a chicken-and-egg problem, and you need to make the platform desirable to developers before they will start developing for it.
They can do an Apple/Sony/Google/Nintendo/Xbox move, "Want your game on Steam Deck? Support Linux".
They certainly have a better card deck than Loki Entertainment used to have.
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