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That's mostly because it's significantly less powerful. Not that that's necessarily a bad thing, it's just a different approach to mobile gaming.
I'm usually not far from a power cable/outlet, and I usually stream from desktop at home, so power consumption isn't an issue for me, personally.
I mean running the same game at the same settings/resolution/etc the Deck will get significantly better battery life. You can offset this somewhat by using task manager to close background processes in windows, but it still takes a lot more power to run stuff on the ROG Ally than the deck.
An example from Ally reviews was Stardew valley ran at 6-8w on the deck, but was pulling 16-20w on the Ally with same settings. Using task manager to close windows processes for the Ally down to the 12-15w range, but that's still a huge jump. This isn't even taking into consideration that you can tweak deck performance settings to run Stardew valley at a much lower power setting, I've seen people go as low as 3.8w giving them 10+ hours of battery life.
Yes, that is, as I said, because it is much less powerful.