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.
I think we've seen this before. Back before phones were "smart" there was one (Nokia, maybe?) that you could put on a little dock into which you could plug a keyboard and monitor.
Obviously, it didn't take off. Perhaps it was ahead of its time. Or, as you say, it wasn't done well at the time.
Phones accepting Bluetooth keyboard connections was very common back in my road warrior (digital nomad) days, but the screen was always the annoyance factor. Writing e-mails on my SonyEricsson on a boat on the South China Sea felt like "the future!"
Slightly related, I built most of my first startup with a Palm Pilot Ⅲ and an attached keyboard. Again, though, a larger screen would have been a game changer.
Obviously the trend didn't take off