Money, as they say, is the root of all evil. To be a bit glib about it, untraceble (even though it isn't) money minimizes the ability to minimize the evil. See blood resources. See pretty much everything from ransomware to murder-for-hire available on Tor.

If you worry about a liberal democratic country knowing what you do with your money, that's a good thing. Power and control in such a place is a very good thing.

Of course, if you live in another political order, you have very good reason to hide what's happening with your money.