Why is it bad for a mutual fund to have too many assets?

I keep reading on morningstar and other finance sites about how "such and such a mutual fund is getting too bloated with assets," and that this is especially a problem for funds that focus on small-cap stocks. And I see that Vanguard and many other companies have closed funds to new investors–even Vanguard’s Windsor II, which focuses on huge corporations, has restricted new investors. Let’s say a mutual fund purchases more that 50% of a company, why is that bad? Isn’t that what Warren Buffet’s Berkshire Hathaway does?

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