Many states dont require boating licenses, works out just fine for the boaters. You also dont need a license to fly an ultralight plane, even with a passanger, works out well there too.
As for high rises, same thing, make sure someone is checking the highrise meets code in its planning and building phase, as long as it does its safe to build regardless of ghe credentials of the person who designed it.
We have countless examples of this sort of stuff being very workable and safe without needing licensing by having other mechanisms that ensure safety.