1) What difference does this honestly make? that human ones can soak up a stray supernova? Surely it being easier to hit our hull makes it a disadvantage, one we're taking for the sake of aesthetics.
2) What exactly would people be doing in Iota anyway? There is nothing there for anyone who isn't a nomad.
3) Both an advantage and a disadvantage. Makes no odds either way. Frankly, I'd rather the nomad sheilds were graviton then 'typeless' from the point of veiw of them being useful.
4) Missiles are for the weak. We can't restock from looting ammo, and they no different from human equivalents. Who cares if the nomads have better gear. Look at the phantom kit, makes for some very interesting reading. Factions like that have to be feared, why take that away?