[cycrutchfield]

If you want to see how putting the entire admissions process on a single entrance exam will play out, look no further than the dystopian cram schools of China and India.

Unless we want to train a generation of rote-memorizers and elite test takers, this is not a direction that should be pursued.

[home_boi]

Those admissions processes are actually seen as very fair processes in those countries. IIRC, there is very high economic diversity in the top colleges in China and India which can't be said about the Ivy League schools.

[cycrutchfield]

Those admissions processes are actually well-known for producing excellent students of rote memorization and standardized tests. They are not well-known for producing well-rounded students that are capable of thinking outside of the box.