You are right!!
Complete privacy is more of a challenge nowadays with governments poking their noses in each and every place. As you said decentralized exchanges can be really good but at the same time they are difficult to operate!!

As @crypto.piotr said it is useless because technology has always been ruled by politician's and it is difficult to actually achieve complete privacy.

Monero and ZCash I think really have been successful in provide complete anonymity but trust me rulers are looking deep into it. I live in India. The government is consistently ignoring crypto whereas the people of crypto community are petitioning for regulations. Supreme Court is confused and trying to pass a fair and suitable decision. Believe me when I told my friends that I deal in crypto they acted like I am a global criminal. That is how the government has triggered thought in the people. Truth is always hidden.

I think DEX will be good but they can be manipulated as well unless they are build on a completely anonymity maintaining blockchain.
Good choice of topic.