Posts: 3,340
Threads: 103
Joined: May 2012
Staff roles: Balance Dev
Vanilla lore (yes, that stuff people always forget about,) does state that Nomads are highly adaptive. Logically, their combat prowess has increased substantially over time as infiltration failed. Because changing their tactics is what they do.
Regardless, they don't have the military strength to overwhelm humanity, will lose and will attract much more attention than they want to. And, again, killing humanity is but a "sidequest" for them.