I decided to do a solo run as a Githyanki before the new patch drops, and I noticed something odd. That as a githyanki cleric you can be a cleric of others that aren't Vlaakith. While it has been a long since I checked the lore, from what I remember, Vlaakith doesn't take kindly to traitors. If a githyanki was to leave Vlaakith, they would be hunted down.
Another problem is that even if you were to RP your githyanki growing up outside of githyanki culture, you can't. Since githyanki PC mentions Vlaakith as their diety, a lot. Example, when your githyanki pc wakes up on the coast, they say how this must be a test of Vlaakith. So, even if you were to pick Selune as diety, pc treats Vlaakith as their diety instead. Which wouldn't make sense in the context since githyanki pc that is worshipping somebody else would be branded a traitor to Vlaakith.

It's a very minor complaint, but I think that Vlaakith should be locked as only diety for githyanki pc, just like how Lolth is only diety for Lolth-sworn pc.