This is a very good point. I use my Apple Watch when running, as my iPhone is too clumsy to carry. However, I have noticed my watch loses the cellular connection even in local parks and forests where my iPhone never drops the connection.In Norway this the govermental rescue tips:
For those who do extreme sports or hiking, that they have non-cellular personal rescue beacons. (PLB)
And do not rely on cellular things.
Which means, you should not RELY on cellular things for safety, but other standards.
After what I am informed, these persons were lucky that the cellular way is improving.
PLBs vs. Satellite Messengers are still the primary way. I guess also for America.
I do not know what to think of Apple on this, because every life is so precious. But, I think that for those who do extreme or hard sports or hiking. Cellular has improved. We should keep improving, testing and maybe bring both a PLB and eventually some Apple Watch, if proven good ?
Of course, the watch is so small that building a decent antenna is difficult, and most probably also the transmission power is limited. I tend to run in the night, and even in this urban area it may take a long time before anyone finds me if I break my leg.
So, I’d say Apple Watch is next to useless as a safety device outside of very densely populated areas. LTE-M1 might help a lot.