If everyone is doing it, or knows about it, it can't be 'an edge,' by definition, imo.
Not true, IMO.
First of all it is impossible in real life that everyone would do the same thing.
Second, even if everybody would do it, it can still be an edge. Like "trendfollowing" can be an edge. Because trendfollowing can be different depending on the timeframe that is used.
"Buy cheaper and sell more expensive" is an edge that ALL traders are focusing on. Nobody wants to trade to lose money.
All people on earth have to make money to survive. So an edge would be to find a job and work. Billions of people do that and the edge is still working.
If you widen the definition of risk management then what OP says could be right.
In that case he means that anything you do is risk management. So each decision, each indicator, each chart pattern , so basically anything you do, would be risk management.
It just depends of how ridiculous far you go with the definition:
Even breathing might then be part of risk management, because if you don't breath anymore, you cannot manage your risk anymore.
Even reading ET can be included in risk management, because while you are reading you don't pay attention to your risk. And reading bad advice can even damage your risk management.
So everybody is right, and nobody is right.Depending on the definition.
However, if there is no position, there is no risk. So the most essential edge is to open a trade. That edge is the start. So risk management cannot be the only real edge.
What is a real edge? And also, what is an unreal edge? Because before you know it, you could start with an unreal edge thinking it was a real one.
This discussion reminds me of "
Zeno's Arrow Paradox and an Infinite Series"