Would you consider the tau to be Nafo crimge?
I hate the Tau with a burning passion. They should be the punching bag of the setting and humiliated at every turn.
I don't give a flying fuck about whatever excuses GW comes up with for their existence, they are a shit faction that attracts the worst the fanbase has to offer.
It doesn't help that they are practically a Mary Sue, they never have to deal with any of the shit other factions do.
Rebellions and uprisings? Ethereas brainwash and keep everyone docile and pliant other than Farsight. There is no possibility of devastating civil wars breaking out.
Issues with AI? None, their drones are loyal and do as they are told, there is not even a hint of the possibility of rebelling and assraping the Tau like AIs did to humans.
Chaos and Warp problems? Tau are nearly blanks (but, as proper Mary Sues, without any of the drawbacks), so they never have to deal with that shit, nor do any of the other races under their thrall. Why aren't human hive worlds "liberated" by the Tau being consumed by Chaos cults? Why aren't there roaming bands of Chaos Kroots? Why do none of their more warp-sensitive races randomly spawning daemons for shit and giggles?
Their technology is either on par or superior to that of the other races, despite them only reaching space a few thousand years ago - and even that they achieved quicker than any other race. All their tech is reliable, works as intended and has none of the quirks of the tech the other races use, and they apparently have no problem inventing new things to face new threats they encounter.
They can survive the attack of any faction, despite other factions realistically being able to squash them like bugs, because apparently fighting Tau will turn their opponent into raging morons that have forgotten they've been waging war for the better part of 10,000 years (or millions of years in the case of Necron, Ork and Eldar).