I'm not sure I agree with the second point. Excel has tons of debugging features, too many. It means most people don't know about all the tools and they're all really badly designed. This is about getting rid of all that and creating one new feature, the tree view. Which offers way more functionality on it's own.
While Excel has SOME debugging features, they really don't work well at ALL for large formulas. I don't need something to help me debug some multiplication.
But when I'm offsetting to an array upon which I'm selecting and summing a subset of these cells with an if-driven sumproduct, and maybe dynamically looking up all of the ranges with more index/matches.... its impossible to look at in the little formula tracing box.
