The Blues and the little guys approach business differently at the practice level. Any physician’s office can tell you about the hassles Blues put you through for claims. Multiple rejections are commonplace; the practices you see have billing specialists who work HARD to navigate insurers for you.
Thus I am not surprised to read of the difference is experiences with regard to ACA.
Aetna signalled early on that, despite its HUGE profits, it was pissed at Obamacare, and it made a big stink about kicking people off their plans (to make Obama violate the ‘keep your doctor!’ promise) as a big tantrumy reponse.