I don't know. What I learn is that I either: a) suck b) am slow c) drastically underestimated my ability d) drastically underestimated the projects complexity

Either way, most of it is negative. I can't think of much good coming out of missing a deadline other than it makes you look incompetent.

And you're better off without learning those things? Man, if there's a problem, especially with me, I need to know it.

No. It's just most people don't view it as themselves being the problem. Which is why it's all mostly a lie.

Even Elon doesn't seem to care about why he misses deadlines because he keeps making them.