But the only reason to have a "smart display" in the first place was because you couldn't (at the time) feasibly have all the guts of a PC in a device that was thin and light. Nowadays you can, so there isn't really any value in having the "base" part as some sort of crippled device, If you have need of such a thing, you might just as well have both be full PCs and sidestep all the drawbacks.