This has always bothered me that there isn't a party list when you're in Solo Duties with NPCs. Especially as a Healer, having to watch the tiny health bar over an NPC's head as they run around the field doing combat (where NPC health bars get mixed with Enemy healthbars easily) is a huge pain. How am I supposed to keep an NPC from dying if I can't see their healthbar!? Especially since I spend more time doing roulettes and stuff on Healer, so I'm much more used to watching the party list for my party's HP....
The MSQ 95 Solo Duty makes it pretty clear that the game treats it as a party internally. I was able to dance partner one of the NPCs fine (no spoilers!), and Closed Position only works on party members... Plenty of heals only work on party members as well... So if it's already internally a party... why not just show us the party list?
I dunno, it's just always bothered me. I think it would be a huge QOL improvement to give Solo Duties a party list just like all other duties. At this point I'm just actively avoiding doing any Solo Duties on Healer unless it's a job quest...