Is there anything technical that would prevent pairing an iPad with an
Apple watch ? Maybe app developers will make it possible ?
If it is prevented, it'll be done at the operating system level, beyond the reach of app developers. There's nothing technical preventing it, it'd purely be a design/usage-related decision.
As an iPad user, I'm definitely sympathetic to pairing to iPad. I expect that, even if it's missing for now, eventually there will be some functionality, once Apple gets a better idea of how people want to use the thing (similar to the way they left a camera out of the first gen iPad).
Part of the point of tethering the watch to iPhone is the internet connection. Since a wi-fi-only iPad (or iPod Touch, for that matter) can't be counted upon to have a continuous web connection, Apple may have decided that the loss of functionality/frustration arising from the lack of a connection will create more unhappiness than the ability to pair to iPad would cause happiness. And while I'm sure there are those who have their iPads with them at all times, I think a far greater percentage carries their iPad far less frequently. With tethering being a necessity, it makes sense to focus usage habits on the device that people are most likely to have with them.
