I know you can switch between watches at any time.

But while I have one watch for general wear, I do choose my timepiece to suit the occasion, and having to go into a menu deep within the wear app to change watch before going out is annoying. Especially when I haven't worn that watch for a couple of weeks and all my apps are now out of sync.

I strongly suggest to Google adding support to synchronise with any number of watches at once. Then I could just put on a watch and go, no messing about.