What is common knowledge in your field, but shocks outsiders?

Almost all of the bugs and problems and breakage in the software you use is known to the engineers, we just aren't allowed to fix it. Gotta ship new features.
Reposted from Margaret Adelle
What is common knowledge in your field, but shocks outsiders?

The number of parents that don't care much about their kids and/or have very thinly veiled resentment against them is much higher than most people think.

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