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You never saw a load-bearing Excel sheet. Like if this formula stops working, there's no payroll.

Not payroll but 15 years ago I worked in a fairly large company where billing (in a smaller subdivision) was completely reliant on excel.

Excel runs the world. Occasionally an Excel product becomes important enough that it requires specific software to be built.

In many ways, recent LLM stuff is just the same process as how Excel took over the world.