I can beat the Githyanki fight without cheesing or buffing or positioning, BUT I can also have several members downed or maybe die based on Initiative order and some Saving Throws.
There's just no reason why their stats are so high in everything, even WIS which a Githyanki Fighter would never have a lot of and also STR CON DEX.
It really depends on the rolls and if we can spread out enough before the Bomb and other dumb AoE. A few times I have a character downed in the fight before it even gets a turn in the first round.