Because phones are small, it’s easy to underestimate how powerful they are. Give an iPhone a larger display and it would make a fine desktop PC. Case in point: A new video shows an iPhone X running Mac OS 8.1 as well as a couple of games.
Admittedly, Mac OS 8.1 is hardly a modern operating system. (Apple introduced it in 1998.) And some might not be impressed that an iPhone can run an OS designed for 40 MHz processors.