Just to offer another perspective, this covers just how difficult the burden of administrative tasks already is for physicians: www.ncbi.nlm.nih.gov/pmc/articles/PMC8522557/

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.