Do I've noticed a trend that many parents here have probably noticed without realizing it. The younger generation prefers smaller screens. With not only the presence, but the prevalence of people under 30 stuck to their pocket screens, a smaller but more functional form factor seems like a natural progression. I still have trouble typing on a phone, but I see kids typing as fast on their phone as I do on a keyboard. Just look at the switch, gaming phones suck because mobile games suck. Put real games on a mobile platform and people will go wild for it. Just look at how young millennials and zoomers bought up the switch, it was out of stock everywhere for the first 2 years.
The steamdeck and and whole mobile PC platform isn't taking off like the switch did, but there is a lot of power tucked in that tiny package. It might not produce high end graphics like a 4090, but compare it to something 6-7 years ago and those APUs have as much power as a high end graphics card did.
AMD has said they aren't likely to upgrade the graphics on APUs until the zen 6/RDNA5 so the 780m on APUs might be standard for a long time.