Cramming for an entrance exam is a revolting waste of a life. It's enabled by a system that cannot and will not evaluate students on their ability to commit to something that actually matters.

I agree that "well-rounded" people without depth are not as interesting or as valuable as people who've picked one or more topics to learn in detail, especially since the latter can often be well-rounded and also have an area of expertise. However, a bit part of their value comes from their ability to do something without anyone telling them to do it. An engineer who spent six months writing a protein folding simulator out of obsessive interest is a much better pick for a computational chemistry course than one who spent that time in a cram school.