As I understood the grandparent post, the idea is that a highest-level university should 10× its student throughput, and 9 other, lower-level universities would be made redundant by that.

This would make sense if all what an elite university did were providing elite-level education. Of course exclusive schools provide other benefits, often more valuable for the target audience than the education proper: a highly filtered student body, networking and bonding with the right, upwardly mobile people (either mega-talented, or just smart kids of rich and influential parents), a luxury-grade diploma that few can afford. Maybe you could theoretically 10× Stanford or MIT, but likely not Yale.

Stanford has a $40 billion endowment for 8k undergrads. UCLA has a $10 billion endowment for 34k undergrads. Naturally, the class sizes will be much larger. The UC system does not put 100% of students at UC Berkeley and UCLA, they distribute it across several campuses and distance education and maintain a leveling system that helps promising research talent be in the room with experienced researchers

Despite rising costs, a college degree is still a positive lifetime investment for students (not to mention the positive externalities educated populations have on society at large). The bulk of US college students attend colleges who do not have the resources to build high-quality, industry relevant curriculum, train teachers to teach with modern pedagogy, and efficiently manage dorms, student affairs, and other administrative infrastructure

HYPSM choosing to share land, curriculum, expertise, and administrative infrastructure through network'd partnerships would lead to massive economies of scale and a broad reduction of educational costs. Another way to think about this - is one city of 1 million people more efficient to run per capita than 10 cities of 100k people? The answer is a resounding yes due to urban scaling. Colleges are effectively mini-cities

"I think that you fundamentally misunderstand the markers that make an in-person education higher quality" -> I founded an in-person college with regional accreditation that had a lot more 1:1 and small group teacher time than HYPSM and an average starting salary on par with CS grads from these schools. Our alumni have gone on to become YC founders and can be found at most top tech companies and startups

It is a choice to value exclusivity for exclusivity's sake (eg. withholding JSTOR data from students of colleges who can't afford those costs). The best institutions (eg. YC, Apple) care a lot more about what you can build than what school you got into at age 17

Pretty much agree but may I also add that Santa Clara County would probably not allow Stanford to increase its student body by any real sizeable amount due to restrictions in traffic, building, parking, etc, etc.

I don't think they're suggesting we reduce the amount of faculty. They're suggesting that you ask all the faculty to share less space, increasing the efficiency of the real estate holdings. Also by reducing the number of schools, you reduce the amount of expensive ancillaries.

I mean, is the goal of an elite college to educate? Or is the benefit to sift through the population and pluck out its masters?

I don't really care that UC has a lower "reputation" than Harvard or Stanford. The fact is, the UC system has produced more fundamental research and more actual value for the population and the world at large than Harvard or Stanford. Even if a UC degree is not quite the "golden ticket" that an Stanford degree is.

Concentrating individuals into a smaller and smaller elite benefits them and only them. The U.S. has done this with capital allocation in its economy and it has and will continue to be a century long arc bending toward utter disaster.

What do we actually care about here? Education?