Traditional opinion is that AIO PC is bad design (except looks) because it merges display and computer. They work for different lifetime (display lasts longer),

Traditional opinion is that AIO PC is bad design (except looks) because it merges display and computer. They work for different lifetime (display lasts longer), unable to self repair, need to send whole display and computer to repair station, non-upgradable, unable to use it as a monitor. But now maybe it can be thought that both lifetime is almost same, rarely fail thanks to solid state (except fans). So AIO would be totally fine if they implement HDMI-in if you don't need upgradability.