@Carl-Lee You are correct, that is exactly how it should be if you read the descriptions of Garmin, but unfortunately in reality it is a bit different:
My experience was, that it works from time to time, but not always. Specially my experience that Tread messes up not only the routes etc. on the XT2, but also the Garmin explore data in such a away, that I haven't been able to "repair" differences between Tread APP, my XT2 and the Garmin Explore webpage. It was that bad that I lost all the data I already have migrated from various sources into the Garmin Tread and Explore universe.
Beside that I must admit, that it have worked for a very short period of time and only as long as used it more or less seldom. As soon it is was used heavily for planning and organising things, it messes it totally up.
Greetings
Thomas