I think it's a nice overview. I don't mind that certain things appear more than once as "leaf nodes", because it shows that the same methods can be used for different things. Visualizing this with only one "leaf node" each would have been more messy in my opinion. I also think the differentiation of Classification and Regression is justified, because while Regression can be used for Classification, it's not quite the same thing.

I'm not an expert, but in my opinion the difference is that Classification is sorting a basket of apples and bananas into two separate baskets, while Regression is predicting which fruit will come out of the basket after X apples and Y bananas.