Earlier quoted context omitted.
Honestly seems like the main reason to buy an Ultra 2 over a 10 is if you dive, or really, really need the extra battery life.
Some concrete reasons I have for wanting that extra battery life: camping, hiking, and road tripping. I can keep up with charging when I have a predictable schedule. When I don’t, I’m always running out of battery and often in the worst moments, i.e. when I’m just starting a hike.
camping and hiking: sure, but for overnight trips, i have a battery pack (for my phone) that also has a magnetic watch pad.