I understand your point but I disagree with your conclusion.
True, the Kids that followed the flute playing Rat Catcher of Hamelen went into oblivion. The Buy & Hold Investor also losses his shirt if a Deep Diver does not recover.
In investing there is a cardinal Rule: Don't let the System Rule you. Rule the System: Bail out if you no longer think the stock is worth having.
We agree to have different opinions on this, it appears.