peter thats totaly understandable if you look at it just from one way, but there are many other users out there that would greatly benefit from iwatch control.
I personally would not use it on stage as you said it would look unprofessional, but i would use it off stage all the time cause i could remotely turn volume up or down for backing music, i would use pause to quickly remotely stop music when sudden unexpected needs occur an unexpected speech or any announcement, as someone else has pointed out a remote start of a floor show that has no engeneer or anybody to do this for you yet you are no where near the playback devices, dancing group entering from side stage on dancing floor with the operator in the dancing group can trigger start and immediately enter dancing floor, many others , so this is not just a solo performer on stage tool it has much more potentual if it was there for the users, but if its not there then it wont be used, sometimes you cant just rely on some peoples perspective that are not thinking outside the box.
I use my iwatch for many things as all my friends and relatives do, it is becoming a part of our everyday life just like the iphone and ipad, it just makes sense to be able to do this with ST3, i never thought i wanted to remotely take photos when i bought the iwatch, now i use this all the time when on holidays and want to be in the photo when there is no one around to do it for me i dont carry a normal camera all i need is my iphone and iwatch, i never thought i would be paying for things using my phone or iwatch but now i dont carry a wallet for that reason my pockets are a lot lighter thanks to someone that thought outside the box.
So by having iwatch control it gives the ST3 user the freedom to be away from the device itself or any floor foot pedal or a guitar mounted remote, it means i can be sitting behind the bar having a social drink with the guests you could say mingling with potential new customers while still in firm control of whats going on on stage. And i am sure others could come up with many other scenarios depending on their way of using this wonderful and flexible playback tool.
Dont limit your creativitys perspective.