Personally I want LTE on my watch for when I run. Listen to Apple music and not have to take my phone for emergencies.
I can understand the emergency factor playing a role for LTE. But when it comes to my workouts, I detest distractions when I'm running or weightlifting. I prefer stay focused as possible, but I understand there are those moments where we least expect an issue to arise in that one call that could be pertinent incorporating LTE in the Apple Watch, being your iPhone may not be near.