The same way it's unrealistic for you to think your mechanic can change your spark-plugs over the phone...
He can tell you where to go and maybe some advice on what to look for - but other than that you're on your own.
I think your analogy is flawed, so I'll fix it for you.
I drive a Ferrari (I dive), and although there are a lot of great mechanics (doctors) out there, they don't all have experience with Ferraris (dive medicine). Since I like to drive around to places where there might not be a Ferrari specialist (dive in places where I don't know there's a great dive doc on call), I have signed a contract with Ferrari (DAN) to have a specialist at the ready in case I need assistance. While I don't expect Ferrari's mechanic (DAN's dive doc) to fix me directly, I do expect that they can consult with the mechanics (ER staff) I end up with to ensure they understand the unique issues associated with working on a Ferrari (dive medicine). In that way, I hope to get the best diagnosis and care for my car (body) so that nothing is overlooked resulting in a breakdown (I don't end up dead or crippled). I'd hate to have some little knocking noise (DCS symptom controlled by O2) that seems trivial to a mechanic without Ferrari training (doc without dive expertise) pushed aside when it could be a symptom of a serious issue needing prompt attention.
If the mechanic (ER guys) won't take the consult from the expert (DAN docs), especially when I've told them I have them available on call, then they are being negligent and I've probably ended up at the wrong shop (hospital). Since I paid Ferrari (DAN) a fair chunk of change, and I've heard nothing but praise for how invested they are in helping customers in need at every opportunity, I expect that they will at least try to intercede on my behalf.
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Simply put, if this is the way that DAN works, that's fine with me. Of course, everyone, especially the people who are paying them money, should know exactly what they are paying for. No one should be disappointed by the level of service received as the OP is. No one posting on this thread should be surprised that DAN acted as they did, but some people are. If this thread serves to clarify what DAN will or won't do and sets peoples' expectation correctly, that's a good thing.