Privacy is a necessary feature in my opinion, but why hasn't Monero become a main coin?
Maybe Due to lack of demand and market correction it has not yet recovered, but if those who already understand what Monero is, they will happily continue collecting and accumulating to this day.
It was not just MAYBE as it was the real thing that happened with Monero as people didn't see it as a valuable asset that could give them a huge profit.
As an investor, I don't just look for privacy but for an ROI which definitely I can't find it with Monero so why do I have to choose this project which in fact there is Bitcoin that really suits my goal? Practically speaking, despite the fact that Monero gives privacy, unfortunately, it was not the thing that most of us wanted to see which makes them ignore this coin.