Well, ok, but I might have thought there would be a standard that would incorporate a UPS and even might fit the same hole (though with less capability, I suppose.
I think the connecting the monitor too bit is a bit off-topic for what I was suggesting - sure some use a UPS so that they can keep using the computer when the power goes out, but the primary reason is to allow the computer to shut down gracefully...that's more the use-case I was suggesting.
Of course, there's no telling how long a computer *needs* to shut down gracefully, but that's true with the current external UPSes too.
Anyway, I tend to think it's something all computers should have, even if there needs to be a 'new standard sized hole', or whatever, but then I've formed that opinion while working in China where the power is a little less reliable than in some places (though, to be fair, it has been much more reliable over the past several years).