Opinion: How did a covid-19 vaccine come out so fast, but we can't make an HIV vaccine?

 To understand this concern/opinion you first have to understand how the Novel Coronavirus 2019 (Covid-19) vaccine was made. As we all know, humans contain genetic code called DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), well viruses contain RNA as well. The vaccines made for covid-19 use this genetic material to train your immune system to fight this virus (either through mRNA strands or by using a viral vector to deliver the genetic nucelic acid). Its actually pretty neat and the concepts have been around for a bit... but it has me wondering.

We know Human Immunodeficiency Virus (HIV) is a single strand RNA virus, so why have we not been able to create similar vaccines for it? See, they are both in the realm of riboviria, which means that they are RNA-dependent viruses, so something has to give. Is it that the medical research community doesn't believe these vaccines are effective? Or that they are making too much money on treating HIV? Or maybe its that they aren't being pumped enough government money to care yet? Who knows. Hopefully someone will make a vaccine soon though... or at least give us some answers as to if it is even possible.