Comment by TonyAlicea10

True, though I'd say more bug impact than bug free-ness. If the 2% of bugs is in the most critical area of your app and causes users to abandon your product then you're losing ground.

That's one thing I think is good to learn from mission critical architecture: an awareness of the impact and risk tolerance of code and bugs, which means an awareness of how the software will be used and in what context by users.