I would say that monocultures, monopolies, vertical integration, etc. are all really good at making a local maxima, but at the expense of making it harder to find things that might be better still. And... sincerely, they are good for local maxima. They have the mindshare, they have the money, they have everything they need to succeed, today. And then tomorrow will come and they'll be stuck. But that doesn't mean that they can't be good, just that costs have to be weighed.