New to the Watch, wife and I have had one for a couple of days. So we're running WatchOS 1 at the moment.
Just wanted to point out that sending messages, even in version 1, can be done entirely hands free. Tapping send is not a necessity. After dictating the message to Siri and being presented with the screen to send it, just tell Siri to send it.
"Hey Siri, send a message to my wife saying Be home in an hour."
<screen displayed with message and Send button, etc>
"Hey Siri, send it."
Not having to explicitly send the message in the WatchOS beta is great so long as the option to send immediately hands-free is still present. If the timeout is too long, the context of the message might be lost on the receiver side (depending on the pace of the conversation anyway).