I'm trying to look at this objectively. Even that is likely when the virus was a complete unknown. They had to prescribe something to help at least treat the symptoms. Then you also have to look at vaccine availability, and whether the patient was vaccinated or refused to be vaccinated prior to contracting the disease and seeing the doctor.
There are too many unknowns and circumstances beyond "a doctor prescribed it and therefore it must work". For the record, I've been prescribed incorrect medication in the past, requiring a second opinion. Others have too. Even GPs don't always get it right...
The only logical and well-reasoned response you have made in this entire debate. There is hope for you yet.
The fact is with most illnesses, doctors prescribe medications to treat the symptoms and then hopefully that actually does also tackle the cause.
And no, before the vaccines arrived on the scene, there was nothing else other than doctor's personal experience and ability to treat the symptoms while the body fought off the virus. There has only recently been one drug "approved" to deal with the virus directly and that is Remdevisir (costs a fortune and is just about not being used at all in SA).
And no, a patients status regarding being vaccinated or not, is not going to influence the treatment much at the moment, UNLESS the doctor concerned can see from his diagnosis that the patient is only mildly sick -- the treatment is likely to remain exactly the same whatever its. He might be careful and check for contra-indications that indicated some drugs should not be used on patients who have had the vaccine.
And yes, there is plenty still unknown about this virus. The search for effective treatments, whether this comes from repurposed drugs or a new blue pill is far from over.
It does not matter what drugs a doctor chooses to use, it is his training and experience that guides home first and foremost. And just BTW, HCQ IS still being used to treat Covid 19 patients regardless of what the regulators have had to say about it in conjunction with other medications.