Have you ever heard of a "minor major 7" chord? How about a "half diminished 7" chord? Yeah, at the time I had been playing kalimba as long as you probably have, I didn't either.
On the Freygish karimba, you can make the "C minor major 7" chord by simply playing the four tines on the left side of the upper row. You can play the "D half diminished 7" chord by playing the four tines on the right side of the upper row. In other words, you get them for free, and they are easy and obvious.
And THAT is the whole magic of the kalimba: each kalimba can be, and should be, set up to play its own magic in a very simple way.