I don’t have the cellular model and haven’t missed the functionality at all. I can still use apple wallet to pay for things when I’ve left my phone at home and the gps function still works for exercise. I can text and answer calls from it when in range of my phone.
I like to have my phone with me so its really just the rare occasion I forget it when going to the shops, which has happened a few times since I got it late last year. I don’t like carrying a phone when running so thats really the only time I can see where the cellular could come in handy for me, for example if I get injured, but I’m never in remote areas.