I can easily see the future of personal computing being a mobile device with peripherals that use its compute and cloud for anything serious. be that airpods, glasses, watches, or just hooking that device up to a larger screen.
theres not a great reason for an individual to own processing power in a desktop, laptop, phone, and glasses when most are idle while using the others.
And the hardware to get an SoC with phone-like performance in a laptop or desktop form factor is relatively cheap, just because you have so much more space and power and cooling to work with.
(Your laptop-shell definitely needs its own power supply, whether that be a battery or a cable, because the screen alone will take more power than your phone's battery can provide for any sustained period of use.)