Firstly, AZT was not introduced as a typical Chemotherapy drug (that is to say, it wasn't classed as a CTX because of the below.) It was created to target the theory that cancer and tumors were the result of a retrovirus. The mechanism of action was different than other chemotherapy drugs. The hypothesis that cancer was a retrovirus outcome turned out not to be true. HIV/AIDS is however, a retrovirus. It's a Lentivirus.

I know it's popular opinion on anti-medical sites to spout this belief, but it's factually incorrect. I wouldn't bother pointing it out if it was factually true, but when things are false, they're false and should be pointed out.

Then we come to this oft-quoted trope that AZT has killed more people than HIV/AIDS or that AIDS is survivable if it wasn't for AZT.

This is also factually incorrect. If you have unmanaged HIV/AIDS, the outcome isn't going to be a long healthy life. AZT isn't perfect, but it does what it needs to do in most cases. The alternatives are management of symptoms, not management of the underlying disease.

There's so many specific mechanisms involved in Retroviral/Lentivirus infection.

As I've said to others here, you're more than welcome to infect yourself with HIV/AIDS and not manage it and tell me how that pans out for you. No cheating with biologicals either. No monitoring your CBC either. No testing your bone marrow for IMDs.