Agreed!
Never use it and would like to change its function...I would guess this will be released in an upcoming update...
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Use Siri or mainly my phone for longer text conversations...I find the watch more of a convenience to check incoming messages and alerts so I don't have to go to my phone...I feel that I would be going "out of my way" more to try to have a full conversation on the watch than to just use my iPhone. Of course it all comes down to personal preference, I got the 6 plus for the large screen and the watch for the convenience and fitness tracking...we all have different perspectives.
Now, I will use the watch to answer incoming calls when my phone isn't readily available or if I'm in the middle of doing something and don't have a free hand. But in terms of initiating conversation...I still go to my phone first...
THIS.
The watch consumes, the phone initiates. Can't see it any other way, but I recognize I'm not everyone.