Re: I sort of agree.
>I've got no idea what that killer app might be, sadly.
How 'killer' that application needs to be (the benefit) depends upon the cost (retail price, appearance, battery life etc) of implementing it.
There are quite a few very useful things a 'connected' watch can do, without even having to boast a pixel-based display. Examples are 'Find my phone', 'warn me when my phone loses contact', 'mute my phone/reject call', ''pause music / skip track'.
Information that can be communicated to the user by means of just a watch hand include: direction of travel, speed, various notifications, minutes to next train etc.
My preference would be for simple 'connected' features included in a conventional, good looking watch.