NYC certainly has more of basically everything. The question is whether that actually matters to a given individual.
Each individual has practical limits to how many other people they can have meaningful relationships with, restaurants and bars they can try, and so on. Beyond those limits, there is going to be a diminishing marginal utility to more, and pretty quickly the marginal utility will basically hit zero. In less technical terms, if there is enough of something, then more than enough of that thing isn’t really useful.
As a quick illustrative anecdote, I live in a smaller city, and when I first moved here for grad school, the restaurant scene was not great, and it did feel like we were cycling between a relatively small list of favorites due to lack of options. However, eventually the restaurant scene took off, and at a certain point, I realized there was an ongoing effect where I would read about a new restaurant opening that sounded great, I would put it on our list to try sometime, it would have a successful run, and then it would close, all before we got a chance to try it.
This is an illustration of how our city now has not just enough, but more than enough, of a restaurant scene for our purposes. Of course I am just one individual, and others could be more active in terms of trying new restaurants and do a better job keeping up in my city. But for each individual, there will be some practical point at which there is enough, and beyond that is just a not-particularly-useful more than enough.
OK, so to me, it is quite easy to imagine Boston being more than enough for most students in every significant way. For such students, NYC would then be even more more than enough than Boston. But that won’t actually improve their experience, because it is beyond the practical limits of where more is helpful to those individuals.
But maybe a few individuals would really feel like they exhausted all Boston has to offer students in less than four years. Even saying that feels implausible to me, but that is up to each individual.
Edit: Oh, a quick addendum. When people living in a more than enough city are still feeling a little bored, the obvious answer is to take a trip. Then you are not just getting more, you are getting something very different entirely.
I think some people don’t like traveling and staying away from home much, and obviously there is some cost associated (although I had a lot of fun in some student hostels back in the day), and so want there to be more available to do in their own city, which is fine. But if you like traveling, then I do think this means you need less in your own city, because the rest of the world is available to you as well.