I just don't see the point of adding cellular coverage to the watch (for me, anyway). I nearly always have the phone with me.
Occasionally a voice call will come in, and I'm either driving or at home with the phone in another room. I can answer the call easily on the watch, Dick Tracy style. Having a watch with cellular would be a waste of money for me.
Yeah. We bought the cellular version of the watch due to a couple of other features. But the times we would really need it are small - mainly if we are out exercising without our phones (long walks from the house) so maybe we miss a call or a message until we return home. We don’t stream music to our watches, and we tend to carry our phones on long bicycle rides anyway.
Another scenario would be a long walk on a beach or hanging by the pool on vacation, or going out on the water. You can safely leave your phone locked away back in the room, and the watch is waterproof so you don’t have to worry about it getting wet. Just not that common for us and we don’t mind being incommunicado for brief periods of time.
BTW, I love, love, LOVE the phone in another room or place feature. My phone is usually in another room - in my purse or on my nightstand, yet I can interact with it anywhere in my small house. And if out doing stuff - sure my purse is with me, or in the back seat of the car or whatever, but I don’t actually have to dig it out.
When driving I’ve often just say “Hey Siri, route me to XYZ” and the watch figures it out and I’m running a route on my phone with voice prompts from my phone which I can hear even though it’s still in my purse, and wrist taps from my watch.
Putting my watch on airplane mode on a plane puts my phone on airplane mode too, so, again, I don’t have to dig out my phone. Probably should mention that turning airplane mode off, you do have to do it on both devices individually.