I know they came out with an LTE-enabled Forerunner 945 late in its cycle. I don’t know if they’ll add similar functionality to other models, but that’s one watch with that feature.
Personally that device never interested me because:
1) if I can rely on cell phone signal, I’m likely doing a quick and simple hike where I don’t have to worry about draining my cell phone battery in the first place, or
2) if I can’t rely on cell phone signal (much more likely), which is especially likely in the US wilderness, then if I’m doing something precarious in a remote setting I’ll have to bring a beacon and satellite communicator anyway. Like an InReach Mini.
The fact that Garmin is releasing even higher end watches without cell phone connectivity likely indicates there’s not a lot of people buying nearly $1k fitness watches finding that functionality compelling.
Obviously people doing this are likely too narrow a segment for Apple. Like, why would Apple care that I’m not buying their watch? I was just engaged by their headline marketing for this watch until I saw the specs.