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Diversity is like salt in food.

You want a bit to make things tasty and healthy, but too much is actually bad for you.

Analogies can be well used, but here all you said is "I prefer to have just a bit of diversity" in a pseudo-explanatory way.

Nowhere in that comment did I ever state my preference.

No you didn't, but I find it hard to believe you would opt for a lot of diversity, given that you state it would be bad.

To quote from A Bit of Fry & Laurie, 'well of course too much is bad for you, that's what "too much" means[...]. "Too much" precisely means that quantity which is excessive, that's what it means'.

How much is too much?

I think you can find your answer in the history of Detroit.

On the other hand, the US is quite diverse overall, and is economically very strong; our GDP per capita is the highest of any large country.

The US has diverse ethnic groups that homogeneously live in little enclaves. You have "white" areas and "latino" areas and so on. This is how diversity actually happens in the west.

By a very narrow definition of "homogenous".

Is there some definition whereby Japanese society is not ethnically homogenous?