Since there are fewer and fewer O/Os, with each passing year, the knowledge base is vanishing fast.
That might not be such a problem, if you're a company driver, with or without some interest in the truck you are currently driving.
The problem is in the very high cost to new entrants, in having to re-invent the wheel.
This is aggravated by rookies telling the pro's how to make good money, running cheap.
Rookies will learn, one way or the other...
If they reject the sage insight offered by the pro, the pro will become more selective in the wisdom they share.
Sharp pencils and fast spreadsheets are no match for a good head for business.