It’s almost the exact same performance profile - calling it a Deck 2 would be borderline consumer fraud. But more importantly, Valve want to be very consistent in their communication with developers: just like a console, all Steam Decks are designed to be almost interchangeable from a developer perspective, with only slight differences at most. When Valve release a device that developers need to target differently from the current Deck, that will be the Deck 2.
Wait, what does ‘Use native color temperature’ do?