I think most college instruction in the U.S. is now online. My eldest child, studying computer engineering at a large public university, had 3 out of 4 classes online last semester and will have all 5 online in the coming one.
Colleges have determined that Zoom classes are good enough to warrant academic credit. If so, high school students should be allowed to enroll in college classes they are prepared for, and the credits they earn should count towards a college degree.
The most prestigious U.S. colleges reject most of the applicants who are qualified to do the work. They have resisted expanding their enrollment due to limited dormitory and classroom space (and to maximize prestige based on scarcity). Harvard's
Math 55 is a famously difficult course for ambitious math majors. Currently, whether you can take the class for credit depends on getting into Harvard, which in turn depends not just on grades and test scores but on your ability at a sport, on whether your parents are big donors, on your race, and other non-academic criteria. This should change.
