Many people try to avoid just this (I marked in bold). This carries great risks and contradicts anonymity.
As for the demand for DEX, it already exists, but there is no fiat. If it was there, then I think this "explosion" would have already taken place.
True. In the future we wont NEED FIAT though. Cryptocurrencies is accepted as a means of money MANY places, and the adoption keeps increasing every year.
[1]You are far more private dealing face 2 face, than to transfer money to a centralized exchange like Coinbase, who then reports all your trades to the IRS.
[2]1.) This process is going on, but too slowly. And we need a result now and not "later." Therefore, we have to act in existing realities and choose bad (relatively beautiful future) options.
2.) Both options have their own risks. And both options are good in some ways, and bad in something. I need an option without flaws

Unfortunately, it is too early to hope for his appearance.
In terms of anonymity, Monero is perfect, but in terms of adoption ... like all other cryptocurrencies

Adoption takes time man. It took BTC 10 YEARS to be where it is today. Those who have patience in this market comes up with the biggest ROI, that's my thought process anyway.
The need for truly decentralized DEX's will be HUGE as regulation kicks in. Blocknet predicted this years ago.