People keep mixing correlation with causation.
The reason why ivy league universities have generally stronger students is related to input: acceptance rates are lower and the weaker candidates are pre filtered.
Public universities around the world, obviously get a much wider variance in the student pool.
But that's about it.
There is strong evidence that ivy league students tend to be better on average.
There is _no_ evidence that this is related to the quality of education.
Hell, this is 2026 and that was true already decades ago.
You're not learning calculus or chemistry better at MIT than in an unknown university in Greece or Italy. You simply don't.
The overwhelming differentiator is the student, not the teacher. There's endless quality content and lectures online for the most diverse topics you can think of.
And, again, students in ivy league colleges are pre filtered for the most competitive ones.
And there's also another important factor: good scientists do not make necessarily good teachers. The two skills are unrelated.
And the better the scientist, the more their job is running the lab (fundraising) while delegating teaching to graduates and post docs.