How comes that my phone shows last time watch was connected, but doesnt show where was it connected?

So, i just noticed my watch isnt on my wrist, from vague information on connect.garmin i get that my watch last synced 3am, so i guess thats last time when it recorded body data, and my phone shows last connection 6.30am, which is either when i was at home, or when i was getting in car, is there any particular reason, why garmin watches doesnt show last known location? should i be relieved that i forgot it at home, or should i be worried that it in some mythical way fell off and now is gone? why there isnt such function as last know location for device? (as it would help me if it was in building or outside building.....