How do you tell if someone went to Harvard? Don't worry, they'll tell you in the first 30 seconds.
But I think it has direct relevance to the GP comment.
Making it impossible for the employer to know that detail would also incentivize all the schools to provide a good education. Also many top universities are mostly about making connections. While their curriculum is usually very hard, this is also reflected in the grades.. people may still pass but their average drops.
In the US it's even worse, because tuition has to be paid. This already filters out many people from going to a "more elite" school.
That said, I can understand the impulse unless you want to be called "Mr. Harvard" every time you do some dumb shit in the office.
So I guess Harvard wins out! In real life, veganism definitely does though :)