>>716275252They are a relatively new rising empire so they don't have much territory. Plus because they only control a small sector of the galaxy, nobody care enough to put resource in fighting them. The Imperium don't want to waste resource fighting Tau when they have bigger problem to deal with, Ork are fucking everywhere but Ork kinda hate fighting Tau due to their nature, Necron, Eldar and D.Eldar also have bigger thing to worry about. Really the only major threat the Tau ever face were Nurgle Invasion and the Tyranid.
>how the fuck are they even like a real faction when ALL tau, all of them, are in THIS one tiny piece of the galaxyYou do know that a galaxy is ridiculous big, right? Even a tiny section like that is still fucking big.