It is a very simple idea: we like differently. And a wide range of consequences flow from it.
You and I like different things. Also you and I like or dislike the same things for different reasons and to a different extent.
A significant hurdle to understanding this is the difficulty we frequently have in accepting that other people have different perspectives from which they view the same things as we view.
Yet, we know that we all have different experiences and capabilities, and different hopes and fears; so is it a surprise that we have different criteria by which we observe, assess and evaluate anything? This is the basis for variety and diversity. It is also fundamental to trade and commerce; if everyone’s valuation of an item is the same, then there is no basis for trading it.
So if we have any blind spots which hide differences between our valuations, these can have wide ranging consequences for our ability to cooperate and interoperate. They limit our capacity to assist each other and to enable each other to contribute as effectively as we might.
Our existence would be extremely limited if we all liked the same.