Do you think no one in finance has thought about financial regulations until crypto came around? I can assure you there were (and are!) many people paid quite a lot of money to “rethink the solutions in the face of the modern regulatory ecosystem and clean out the cruft that truly has no modern purpose”. One of the reasons securities regulations are “expensive” to comply with is because they’re constantly changing. Why are they constantly changing? Because we’re rethinking how, when, and whether the various regulations ought to be implemented.

The regulations implementing Federal securities laws are perhaps the most nimble, iterative, and “listen to your users” driven regulations in the US.

Certainly no one in finance ever thought about programmatic regulation of a currency. But your comment is of the type that has the premise "everything that could ever be thought of has been thought of before". Well obviously that isn't true. And it also isn't true that everything that has been thought of and not done is not doable.

Certainly? How certain are you of this?

I am not so certain.

I don't think that, no. Still, different people with different toolboxes will come up with different solutions.