You maybe right. I think this decision entirely depends on the person himself. If he is not good at trading, then holding will be the best option for him to have a good profit at the end. Even professional traders would really experience loss because no one on this world is a perfect trader which cant really make losing trades. It's normal to get some loses the thing which is important here is that we should end up the day on profits
That the reason professional trader or the whale usually spend more times to create strategy and plan for investment. They do not need to hurry and have wrong decision. They move slowly and follow mentality of other traders on the market. Example the whale, before pump or dump, they usually use FUD + rumor to check the market first.