I supposed that I can live with receiving only notifications on my watch. They provide enough information (subject and a couple of small lines of text) to help me decide whether I need to pull out my phone to deal with a message. And, with the Outlook app notifications, I am able to delete or reply to messages directly from the watch. Replies are done via Siri or with a few canned replies that can be set up on the phone. I think the ability to delete unneeded emails on the watch and then not ever see them again is going to prove quite useful. I am also confident that we will soon see watch apps that support different email clients the way the built-in Mail app is now supported. (For that matter, I am drooling over the prospects of a Tesla app that will let me control my car from my watch the way I can currently control it from my iPhone.)
Watch apps are coming fast and furious, but with the limited screen real estate, only a small number of them will be useful. One that I already have used, and which I think is terrific is the Alarm.com app. It lets me see the status of my home alarm, and I can set it for “stay” or “away” right from the watch. Of course, it is my phone that is doing the heavy lifting, but the software stub on the watch is simple and intuitive, and does exactly what I need.