As someone who kept throwing out MVPs every few weeks to painfully discouraging indifference, the term "experiment" finally started to make sense - each attempt kept missing a leap-of-faith assumption being tested, so each failure was discouraging instead of enlightening/iterative.
I think first time startup founders incorrectly assume building an MVP is like logically assembling a lego set (one best practice feature + research + user feedback guarantees people using your MVP more than once). When that logic fails, it's a heavy hit mentally.
For example, sure you know that people pay for babysitters - but can YOU get people to pay for babysitters? Pretty sure that breaks all viability if false no matter how fancy the product, so might be a good starting point designing the "minimal" part of your experiment. Educational literature might benefit from less semantics about definitions, and more teachings about what a good MVP attempt #1 looks like.