any person who is always optimistic will definitely do holding bitcoin. because they would have to believe that the price of bitcoin will experience a remarkable improvement. we can achieve better results when we can sell and buy bitcoin at the right time.
Those are not optimistic but they are greedy, they always think that they can get more of the price of the bitcoin so they keep on holding it and little that they know that at some point the price wont go up it will go down and then theyve wasted their chance.
We cant hold for ever we need to have a point in which we will sell , this is my personal opinion.