You under estimate the power of cross chain transactions that aren't linked to any exchange.
Especially if the deal is done while in person where the correspondence of the trade is not recorded anywhere on the internet.
You are only thinking of yourself. Most people don't jump through hoops. They use a product and expect it to deliver what it promised as main feature.
Edit: and as a developer, I don't want to be responsible for millions of people being subjected to State wrath some years from now.
Lol yes I am. Don't you do that from time to time?
I am also speaking from my own personal point of view of what I have heard, saw, and experienced others who deal in crypto would like concerning anonymity technology and its usage today...not years down the road.