I even hate looking at files on my phone. Aside from being able to quickly show people your designs, I can't see a use for a small screen CAD. The lack of a pointing device guarantees poor accuracy while editing.

I might be wrong here, but I was under the impression that the watch loses most of it's functionality if it is not slaved to an iPhone. So If you have a phone or tablet to start with, why use a watch to CAD?