i think this one is simple.....
PS4 had a peak power draw (basically when playing games) of around 120W. Its APU was shrunk from 28nm to 14/16nm and that PPD dropped to 86W.
For it to work as a handheld, the exact same APU or something with similar performance has to have a peak power draw of no more than 20W.
So basically when we get to 3/4nm fabrication then yes, we will see APUs that can fit in a switch form factor with PS4 base level power.







