In general, this would be great, but only if more specific Warlock patrons and backgrounds would be implemented. For now, it would limit players to "unquestioning" githyanki - which would by far be the majority, but still - one may want to play a heretic.
Not that it wouldn't be cool to play a githyanki with Vlaakith as a patron, haha. (Could be the UA Undead patron, perhaps tweaked a tad.)
