Excel has outlasted every competitor because it's the universal language for data analysis. Banks, analysts, and customers all use it to share models and calculations transparently. No emerging tool has matched its acceptance across organizations.
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I've heard Excel is dead for over 20 years now. I think this tool's the next Excel or Excel on the web. And yet Excel persists as the common language. I think that's really the need is to have this common portable format that everyone can understand. It's kind of like this universal language where one analyst, maybe from a partner, a bank, a customer produces an output in some format, hands it off to another group, and they can look at it and see exactly how they got to the numbers, how it works. Where the calculations are, and even inside a company, it's that same kind of universal acceptance of the same model that makes the most sense. I don't see anything else coming close to challenging that.