Aether
Kremling
Overall you're right, I just want to be pedanticThe simplest version is that the resolution of the screen basically doesn't matter to power draw at all. It's a little more complicated than that, but that's the gist of it.
All screens emit light. Light is energy. The amount of energy coming into your face is how much energy it takes to power the screen. Or it would be, if screens were 100% efficient, but they're not, they lose some electricity as heat. Not all tech is equally efficient, like the difference between a gas-guzzler and a hybrid vehicle.
So, given two screens, made from the same tech, the bigger screen will eat more power. "Bigger" not "higher resolution." Resolution only matters from GPU power draw, but even then, the screen resolution doesn't matter.
Yes, a lower rendering resolution saves power, but so do low settings in general. A game developer wants their games to look as good as possible and run as well as possible, and so do you, right? If you give them 5 Watts of GPU power, they'll use every drop. If you force a lower resolution on them by picking a 720p screen, they'll just go "well, we're resolution capped, but that means we can push every other setting up to high!"
Same thing with DLSS. All of this "lower screen res/DLSS saves power" stuff is from PC land, where I can force a game to run under maximum performance in order to squeeze out an extra 20 minutes of battery life on my Steam Deck. But that's not how it will work in a console.
There is also a part of energy emitted as electromagnetic radiation outside of the visible light spectrum, and higher resolution screen means more complex/faster working screen controller (for the logic to distribute the information to the pixels), which also takes some power.
(In reality both are so small in impact that you can ignore it)
What DOES make a difference:
LCD and OLED when on the same average brightness for a non strictly white screen, won't produce the same amount of light.
It's that lcd needs to filter out so much of it to not let it get to the viewer, that it has to produce more light to compensate, meaning more heat/power consumption.
Yeah, I know, pedantic, your post was perfectly fine
About all the worries about controller compatibility:
Adapter rails? Sell them for 9,99$ a pop, or if they need a translator chip (would be really weird design decision...) Then have them be 14,99. Heck, bump that up to 19,99$ even for basic ones, people will buy them, can charge them on switch 2 and use them if they prefere them to the new ones. And to make it even more of a no trainer: have it be a order only thing, meaning not cluttering the stores, but giving people that care an option. Don't know, in my mind it's a no trainer, it should be a rather cheap option for Nintendo