Privacy is a necessary feature in my opinion, but why hasn't Monero become a main coin?
For me security is a main feature but people over looked it and see it not that important immediately after creation. except when we lost access to it before we becomes more careful or start looking for it. But for the monero I don't really know about.
Monero is very secured and private. This is the reason why government doesn’t condone the use it because people can easily hide their laundering and tax evasion by just purchasing this coin since there’s no way to track it.
Monero is not popular nowadays for common people because not everyone in crypto seek privacy. The majority prioritize profit than privacy that’s why CEX is still popular over DEX even with the breach of their privacy. Monero is now delisted on some major exchange that makes it less exposed to traders and investors. Monero is not unpopular but not popular either.