The correct question is "Why did we get stuck with Rosie and Wild Bill instead of a Not-Bucky, Not-Widow, or Not-Falcon?". Fun anecdote: there's even a mention of small drones that get launched to cover the massive USAriadnan convoys. Mavericks pick up the part of the leg that the drones can't cover.
On a more serious note I'm pretty disappointed with how little attention USARF got in terms of being made sure it was N4 ready, the amount of attention JSA got (because fuck me did JSA get some TLC this changeover) is what USARF deserved. I would say they are easily the faction that most needs to go to the front of the line for a comprehensive makeover.