You came up with the idea.The point is that with what I came up with they are not newcomers. They were there and are native, and are important to the setting. And I could come up with dozens of other ways that they were there are along and important to the setting, just not in the forefront of gameplay up until now.
This is not rocket science and does not require a 7th(at least) kitchen sink setting to be made.
WOTC didn't do it.
The gripe is that WOTC put it in the core book, plastered them all over their supplements as art, but didn't come up with a similar idea.