So, I do not want to pick apart your post. But a couple of things:
If you have / had your phone everywhere, why do you need LTE on a watch; you have your phone? If you are unconscious, having neither a phone nor LTE watch will do you any good.
Someone a post above you mentioned ‘to have it all the times you forget your phone’. Am I just addicted to my phone so much that I rarely leave it behind?
I just am struggling to see the benefit. I do have a coworker that has one and says she loves being able to walk away from her desk and leave her phone and have the cellphone / messaging capabilities - I totally buy that. But beyond that, how often are people without their phone?
My biggest usage will be not having to whip my phone out for notifications and messages. I can easily flick my wrist, read, swipe to clear.
Full disclosure, I do not have an Apple Watch and plan to get a series 4. I do not plan to get an LTE, unless stainless steel only comes in LTE. And I am undecided if I will pilot LTE or not. Likely only planning to if they offer a trial period again.