Seems to me all outsiders start with LA+1 since the "person" spells (like Hold Person) can't target them. Compare, say, a dwarf to a fire genasi.
I think what tilts the githyanki into LA+2 is the spell resistance plus the "get of out jail free"-type spells such as dimension door and plane shift.
I think what tilts the githyanki into LA+2 is the spell resistance plus the "get of out jail free"-type spells such as dimension door and plane shift.