We've known for months now that Valve is expanding its Linux-based SteamOS operating system beyond the Steam Deck to other handheld PCs, starting with some versions of the Asus ROG Ally. This week, Valve began making some changes to its Steam storefront to prepare for a future when the Deck isn't the only hardware running SteamOS. A new "SteamOS Compatible" label will begin rolling out "over the next few weeks" to denote "whether a game and all of its middleware is supported on SteamOS," includi...