If it's disseminated via oral lore it's expensive to change and is often misinterpreted across a large enough org.
A silent killer of engineering orgs is bad practices that stick around because that's the way it's always been done. No one knows why because it wasn't written down. The only way to fix that is for someone high enough to provide blessing, but maybe none of those things are individually disruptive enough to get the CTO involved. So everyone eats the costs in perpetuity.
Much easier to just write everything down.
Increased difficulty for juniors to ramp up when you are remote is a symptom of a culture with lots of overly complicated processes that are not well documented.