It's one thing to miss out on stuff due to conscious decision, the problem is that the quest gets softlocked due to a single npc, as there is no redundancy there. It’s more like a bug or an oversight, especially if you save everyone else. Funny thing is, Grymforge has got a check like this, due to lava.
As much as I like BaldursGate3, I think I will have to take a break and wait for definitive edition or something. The game will need several patches anyway, ACT 3 aside. And between lack of epilogue and some questionable design choices, I am fine with ending my play through on act 2.
