And I disagree. My assertion is that software that has only bad parts is way more unpredictable than software that has both good and bad. For multiple reasons

And I disagree. My assertion is that software that has only bad parts is way more unpredictable than software that has both good and bad. For multiple reasons: because "bad" is not necessarily internally consistent. Because it's buggy. Unless, again, "bad" here means "objectively good quality but I get to call it bad because it's not in the way I like to write code".