Holding with an exit strategy, or trading with risk management and an emphasis on understanding, are all strategies that most experienced investors and traders will endorse. In short, a little bit of planning will go a long way.
Let's go into each technique (keeping and trading) to see what each has over the other, how they can complement each other, and how each can be used effectively in isolation or in combination as long as we sprinkle in a splash of policy and complexity so we're not just holding into the ground or eroding our portfolio with mistimed trades.