It's more the unique RDNA 2.0 and infinity fabric stuff, that hardware that performance-wise is comparable is able to exceed its capabilities if the game is designed to optimize those aspects (which it was since it's a PS5 launch exclusive which uses RDNA 1.5 and uses AMD hardware designed to get the most out of FSR). The Steam Deck is just a secondary beneficiary of things they were already implementing in the games design. That it can perform to a level that is comparable to the minimums that seem higher on paper. The games Ultra settings also seem to favor AMD with it listing the GPU requirements as a 4080 on Nvidia side and 6800xt on AMD, although maybe that's entirely VRAM.From Steam's most recent hardware survey, about 22% of Linux users on Steam are using SteamOS. Linux users make up 1.38% of all users, so assuming all SteamOS users are on Steam Deck, Deck users made up about 0.3% of users in January. Given that most of those users are probably not even using the Deck to play AAA games, I highly doubt any developers are putting in discrete optimization for the Deck beyond making sure the game runs.
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