As it says elsewhere, this diagram is only presenting algorithms as currently implemented in scikit-learn. Having said that, there is a place for a larger and more comprehensive chart/diagram. But again, as I said elsewhere, even when people ask for such things and promise to contribute, they don't, so I've stopped trying to make things like that.

Feel free to present an augmented version that include the things you mention. I, for one, would be interested in a more comprehensive diagram.