Githyanki lay eggs, so they might be closer to Dragonborn than they are to humans or elves.
True. This makes "romance" between humanoid mammals and Gityanki just as stupid as between Dragonborn and humanoid mammals. Maybe - both being oviparous - they are culturally compatible.
However, even if butt ass ugly, the Gityanki look more humanoid and are thus less jarring on a visual level hence e.g. Gale smooching Lae'zeal brings down the "this cannot work" alarm bells .
