I think that since it's not a real DND campaign but a video game in which you can reload a save and try again, your argument is extremely weak.
Mostly this but also, even at a real D&D table if you feel like really challenging the power and authority of a Lich Queen, what do you expect the DM to do? Sure, she's not a god, but plenty powerful to destroy you and your party so maybe don't go in there and challenge her in front of her people.
I do think the crčche plot point is super lame and bad because of a different reason - it's completely pointless and devoid of any choice.
As for this bit I mean yeah, the creche could have done with a bit more choice and reactivity but it's not pointless, it plays a part in Lae'zel's story, there's a pretty awesome legendary weapon to to find on the way there, and even though you don't get the tadpole removed it's still a pretty awesome bit of story to see.
