I have seen Excel used in places that manage millions of euros of other people's money.

I have seen Excel used for financial planning

I have seen Excel used for managing people's health data.

I have BUILT a test suite for a government offical use communication device - inside Excel. The original was a mish-mash of Excel formulas and VBA. I improved the VBA part of it by adding a web cam to the mix.

I don't sleep well at night knowing how many very very essential things are running on top of Excel sheets passed down like stories around a campfire.