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I think this is a bit disingenuous. There’s no customer interaction in these panels.
So waterfall would be:
Customer says they want to go to Mars.
You spend years building a rocket capable of going to Mars, draining all the company budget in the process.
Customer then clarifies they actually meant they wanted to go to Mars, Pennsylvania, USA - not the planet!
Also the strip stops midway through as Waterfall was an invented thing just for a paper. And during your UP work you actually had the customer put in that input and hence it was like in this cartoon strip.
