> The second one is especially hard to grok for non-techies. I have to explain that if you insist on accurate estimates, you will get grossly padded estimates [0]. And the work will expand to fit the time available (sometimes resulting in the task exceeding even the massively padded estimates because the work expanded with the estimate). I've had many entertaining conversations attempting to explain this.

Sounds like Hofstadter's law.

"Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law."

[1]: https://en.wikipedia.org/wiki/Hofstadter%27s_law