I thank Apple for not releasing an Ultra 3. No FOMO this year :).
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.
I've been doing hikes that last 6-8 hours (I have little kids so we go slow, takes breaks etc) and pretty much every time my Series 8 either runs out our I have to really carefully conserve battery. I'm hoping the Ultra 2 will mean I can just record my hike and not worry about it.