Interesting; can you elaborate? Surely it would be folly, say, to teach some children _wrong_ things simply for diversity. I doubt this is what you advocate, no?

In mathematics there is a well defined right and wrong, but in history there are often competing viewpoints of which none can be dismissed easily. I would say that to pick one as true and discard all the others is folly.

There are still many approaches to teaching mathematics, of varying and debating quality, so many of these concerns still apply. Math teaching is not a commodity we can simply stockpile using contributions from whoever tosses a bit in the kitty.