Just so tired of almost every time a doctor submits stuff to insurance, we have to be the ones to make multiple phone calls to both the doctor's office and insurance to iron everything out, figure out what the issue is (it's always a different issue), and basically be the go-between for the office and insurance. What am I paying $500+/month for?! It's like paying for the privilege of having an exhausting part-time job.
And yes, I understand that insurance wants to weasel out of paying anything, but this isn't even shadiness, just straight up incompetence and lack of communication/following procedures. The amount of emotional energy we have to spend untangling this stuff leaves us drained.
Not all physicians work for a hospital, so I don't think they all have much access to large departments that can take up the slack for them. It's difficult to ask them to chase our insurance for us when the paperwork they already do is driving them insane and taking them away from their patients.
The solution, as you said, is single payer. The overwhelming administrative overhead is a symptom of a very broken system. Nobody directly rendering or receiving care is benefiting from how things currently are in the United States.