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.