HIV/AIDs is a perfect example of why it's dangerous to not distinguish between the two. If you are vaccinated and exposed to SARS-COV-2, you still have a high risk of infection, but because of the vaccine, you have a low risk of that infection developing into the disease known as COVID-19.

If a successful mRNA vaccine is developed to prevent AIDs, it would be extremely important for the vaccinated to know they can still be infected with and spread HIV. It's not any different for SARS-COV-2/COVID-19. The talk in this thread about an mRNA vaccine eradicating HIV is nonsense.