No matter what, nothing will stop me from playing a Githyanki monk!! Nothing!!!!! Unless someone blows my mind with a cool build for a Githyanki infiltrator which is not just 'pick rogue'
No reason not to so long as you can put your +2 in DEX and +1 in WIS.
There are a couple of other races that are marginally better (e.g. +3m base movement or +1 hp per level) but it's only really the ASIs that make a significant difference. But try and get proficiency in Perception if you can.
