The orb dialogue is very idiotic. On the one hand they are heavily pushing you to it (even after deciding against it with Gale, you are offered the option several more times) while on the other hand obscuring the option to choose detonation as an alternative to someone becoming a mind flayer.
I felt there was a change in Lae'zel even without epilogue or romance because she starts making jokes, and overall expresses appreciation for the player group. There also is/was some banter with her about not condoning the culling of the weak in Act 3, but I am unsure if that made it into the game or is just a sourced file.
I guess, I better put the egg thing in the spoilers:
She approves of attacking Esther when being offered the deal about the egg and she has very strong verbal disapproval of Esther's plan in general. In the hatchery itself I think she mostly explains the whole concept to you, I can't remember if she makes comments about the lonely egg itself. If you have it in her inventory (?) during the final battle, she will later bring it to some sages, where the egg is taken care of and finally hatches. If she stays in Faerűn, she'll find other caretakers for it. I thought it was a nice resolution to the situation. The boy being allowed to choose his own future is also a contrast to what she previously told us about Githyanki society - the children being appointed their path in life.
But yes, act 3 could at the least do with some more banter or camp scenes related to character development. Even with Gale, you only find out how deeply terrified he is of loosing the battle against the brain, if you have to talk him down from exploding at the Brain Stem - outside of this, the sentiment is mostly present in his reactions to a few of the more questionable decisions the PC can make.
