Most modern companies drift toward the non-written style (effectively managing by the seat of the pants) because it has the appearance of being more effective, even when it is in fact the opposite. Business myth makes the guy who is always having meetings to appear more dynamic and effective, and is consequently rewarded by upper management.

Ye there are multiple such fallacies. E.g. making brittle systems and later save the day makes you seem competent and important.

Also the opposite effect, where the most productive and important engineers seem to cause most problems and seem incompetent.