And to say you are not supposed to bump into this encounter in the first place? It is an important part of the story, Lae'zel seaching for her kin. Plus why have a part of the map you are not supposed to explore? In case you choose the above ground route to Moonrise Tower you have to get through the githyanki. If the choice you are given is a false choice that would make the game less rich I think. There is a choice I believe, because that allows you to play through the game in different ways. Plus we don't know yet if the main story will require that we find the githyanki camp.
this is a point I'm surprised I never brought up myself. This is a required part of Lae'zel's companion quest. Why should it present such a difficulty bump compared to every other thing at this stage?