It would be one hell of a recruiting drive, especially if Imperial marital law is as much of a dumpster fire as it is IRL.



Even if only one in 10,000 humans would prefer a "blue waifu" over one of their own kind, multiply that by the population of entire star systems and you've got a good deal of defectors...and perhaps more importantly, of *sympathizers*. Taking the first spaceship headed for Tau space would be too much for some humans, but how about tipping off a local Tau colony of an unwarranted planetary bombardment? Or 'mishearing' orders to bomb the warring Orks and Tau forces equally and dropping all their ordinance on the greenskins.