Well I understand and agree with what you are saying in theory. But holding on does not make sense when the trading gods hand you an early assignment on a bull spread.
He got into a bullish position that went in his favor and hit his max profit and you are saying he should change his mind and let it run in case it reverses now in a major way. Theoretically what you are saying is correct but in reality you entered into a bull call spread and the trading Gods gifted you a favor with early assignment on your short leg.
I think the mentality of I got a profit but let me see if it reverses to make even more money is a dangerous precedent to set for trading, IMHO. Once assigned the max profit is locked in. Often assignment occurs when time value premium is really small. So that means expiration is approaching. Exercise and take the money
In my opinion if you have a bull call spread and are assigned on the short call because it is ITM, the best and consistent move is to exercise the call and lock in the max gain and move on to the next position.
In my example, the stock that went from lets say $51 to $59, now has to go back to $49 for you to make additional money. Trade management seems to indicate it would b best to take the locked in max gain as a successful position.
Think of it as an entirely new position. The call spread is now gone.
If someone said to you, hey El Ocho, I'm going to sell you some calls at parity and let you short the stock at the same price. You won't have to pay commission on this trade. You will receive a short stock rebate on your short stock, which will make the trade profitable no matter where the stock goes. You can't lose money on the up side but you can make even more money on the downside. Would you do this trade?
This is the position you would have after the exercise. The only question is there a short stock rebate or hard to borrow fee or dividend.