+1 for this functionality, I end up doing so much activities during the day that the watch doesn’t “catch” I don’t think battery life is a blocker for this feature if it can be turned off, more often than not me and other users of this watch might want to use it just as a daily watch, not just run the occasional marathon, I would very much like to see this feature where the watch automatically detect any reasonably noticeable activity, it could be the daily commute, it could be the dog walk/run, or the missed training where I forgot to select on the watch.
Please consider, currently this is the main disappointing missing feature of the watch after using it for more than one year.