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They don’t, but they define the socket the processor slots into and probably did this to market the newer chips as more advanced than they are (by bundling a minor chip upgrade with an additional chipset upgrade that may have more uplift).
I see no other reason to kneecap upgrades like this when upgrading entails the consumer buying more of your product.
That trackpad was a game changer for playing KB+M games with a controller, but to be honest sometimes I really miss the right joystick. The trackpad can fake it, but it’s not the same.
If they ever do another standalone controller I’d want it to be like a screen-less Deck. Both joysticks and trackpads and a couple more grips.