Emphasis on way more power. Granted, power draw isn't a huge problem for price reasons, since the cost of electricity is usually not that huge of a factor, but if you wind up running a lot of these, it can add up. More power draw is also a detriment if you want to keep things lean for longer battery, which makes me hesitant to put many older stock computers in the critical path of my network.
Don't get me wrong, though. Old stock computers are excellent for a wide variety of tasks, it's just that they definitely don't encroach on a lot of the use cases of modern SBCs. You needn't buy a Raspberry Pi 5 either; plenty of use cases like Home Assistant will run pretty well on a Pi 4 or even a Pi 3, and that's not getting into the many other reasons why a Pi may be interesting (like HATs, being able to use PoE power, GPIO, or even just the I/O in general.)
Don't get me wrong, though. Old stock computers are excellent for a wide variety of tasks, it's just that they definitely don't encroach on a lot of the use cases of modern SBCs. You needn't buy a Raspberry Pi 5 either; plenty of use cases like Home Assistant will run pretty well on a Pi 4 or even a Pi 3, and that's not getting into the many other reasons why a Pi may be interesting (like HATs, being able to use PoE power, GPIO, or even just the I/O in general.)