SteamOS can really only be a good thing for devs, as I understand it. The steam deck gives them fairly limited hardware to target for development if they’re inclined to do so, and Valve’s effort with Proton have done wonders for general Linux compatibility, even in the absence of a native Linux version of their games. That’s opened up a sizable market for them that was previously unavailable.

No trackball for me, but I use a vertical mouse and have my Glove80 mapped to a Colemak layout, so it probably balances out.

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