I am totally getting what you are suggesting, but booking profit is a part of the strategy that any individual trader prepares. Some are here to stay longer and have good risk-taking capability, and some are here to obtain many small wins and move forward. Yes, it is beneficial to book profit when the market is bullish, but you never predict that it will fall soon. Maybe it's going to beat its own higher position. In my opinion, it's completely a personal choice.