I'm just thinking out loud here.
Steam Deck 2 is a long way away, and I think that's great. Giving developers a specific hardware target is crucial, and having consumers feel like they need to immediately upgrade is bad.
However, I think there is room for an advanced SD that's not necessarily "new" but just an external improvement over the existing model at a higher price tier for those looking for a premium experience.
Also I'm going to be nitpicking here, don't take that the wrong way, I love the SD but it does have some weak points.
So then Steam Deck LE would be identical to the current one with the exception of:
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The screen. Wow this is probably the greatest weakness of the SD. A larger display with smaller bezels and better color accuracy would go a long way to improving the experience.
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Hall Effect joysticks. Again, nitpicking here but it'd be nice to see a premium version with these included.
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1TB SSD. I originally bought the 64GB version thinking I would just use an SD card no problem. But the ridiculous amount of shader cache, the various Proton versions (~1GB each) and some other software like EmuDeck and Heroic, as well as the annoyance of moving things back and forth had me upgrading quickly to a 1TB, which immediately ended all of those concerns.
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Different color ways. I'm partial to white but a transparent purple version would be nice to see also.
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At least 1 more USB-C port... so we can do things like video out while charging.
What else would you like to see added?
VRR displays almost require >60hz, they don't work properly when they don't have a significant range to work with. Although in theory if it clocked down to at least 30hz (preferably lower) that would be okay, but that's fairly uncommon.
There are 60Hz VRR displays but they're not as common, especially not anymore. They do exist. With the right VRR range and LFC (low-framerate compensation, which doubles the refresh rate and displays the same frame twice to achieve VRR at rates below what the display supports) it would still be able to achieve smoother frame rates than a hard drop from 60 down to 30 which is what you get with conventional vsync. If a game runs between 40 and 60 FPS and you had the Deck set to 60Hz, you would get bad stuttering/jittering as it continuously goes from 30 to 60 FPS but with VRR it would simply slow down the display gently. My old 2017 Razer Blade Pro has a 60Hz 4K VRR panel and, while I don't game on it much at all anymore, it did work in the same sort of situations.