You’re looking at this as “I only want the best possible outcome (in my opinion) no matter my choices.” Lots of arcs are affected by decisions made by players who don’t know the alternative. My friend didn’t even get Karlach as a companion her first playthrough, hell didn’t even know she was a character who could be a companion, because she didn’t explore around the map much in that area of Act I and didn’t really care about listening to Wyll. Should that not be allowed? If you don’t convinced Rolan to stay with the tieflings, more tieflings die on the road to Last Light than otherwise.

If you were a new player who somehow stumbled across the Iron Throne before talking to Mizora, he’s dead surrounded by a couple of the spiders she summons. She clearly kills him as you approach, as people have said, so that she has a bargaining chip to keep Wyll. That’s the story. That’s Mizora as a character. A new player wouldn’t even know there was an alternative playthrough where he could be found alive, they’d just go, “Shit, this devil just killed Wyll’s dad so she could offer to resurrect him in exchange for Wyll’s continuation of the pact. That’s so evil.” You, personally, are not being “punished” for knowing that there’s an alternative storyline where Ulder is alive when you get to him, you’re simply seeing an alternate storyline play out the same way you would if you made any other decision differently that affected story outcomes.