I actually started DeSu 2 not too long ago and I'm just past that part on Day 7.
As for your complaint:
I actually haven't found any of the Nicea deaths to be obtuse - as far as I can remember most of them are just making sure to pick the battle scene where you save that person when the time comes. Although to be honest I'm not sure it would be such a big deal if some of them died, from a mechanics perspective at least. I mean, at least it's not like
in DeSu 1 where if you failed to view a certain event you ended up immediately locked out of every single route except the absolute worst ones.
Yeah, I'm pretty sure at this point it's an SMT tradition that when in doubt, you must always pick the option that involves fighting the greatest number of people.
As for your complaint:
I was wondering about that too, although I didn't bother to look it up. I feel like they give you more than enough chances to raise her affinity so unless you went out of your way to not talk to her the entire time the chances seem slim that that would actually happen. At the time I actually thought it would have been related to whether you viewed the event beforehand where you can encourage her.
I actually haven't found any of the Nicea deaths to be obtuse - as far as I can remember most of them are just making sure to pick the battle scene where you save that person when the time comes. Although to be honest I'm not sure it would be such a big deal if some of them died, from a mechanics perspective at least. I mean, at least it's not like
Haru