Even from your perspective—which isn’t Luddism, it seems to be an assumption that a small handheld device with passive cooling is inherently underpowered and that larger form factors will always have a performance advantage—the thing that phones are able to do right now, at least in Apple properties, is improve the performance/power ratio so significantly that one of the largest technology brands is switching their entire large form factor lineup to the chips designed for their small handhelds.

In other words... the thing phones can continue to do for general processing power is dictate efficiency by necessity, and make that efficiency generalizable if there’s an interest in that investment.