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Yes, it lowers criminal margins by 10-20%. So what? For it to make a meaningful difference that number would have to be a lot higher. And it's unlikely that the current approach to AML will result in that number changing substantially because criminals only need one weak link in the financial system to undermine the whole AML apparatus.

Most economically driven crime has very high margins. Wholesale drugs in the Netherlands cost ~10 times what they do in Colombia, and I don't think "only" 8xing your money on a drug shipment instead of 10xing it is a very good deterrent.

Edit: And you can look at threat intelligence company reports to find that Russians already sometimes pay in excess of 40% to "cashout" business email compromise or investment fraud wire transfers. They happily pay this because even getting half of $80000 when all it took you was sending a few emails with forged From headers is a great deal if you are already morally bankrupt enough to stomatch stealing.