Holding Bitcoin isn't about how well it'll perform 10 years later but monitoring the risks and trends around the project saves the investors from panic sells. These prices go back and forth like table tennis match and presents no preparatory warning towards the next price move. Hence, staying informed and knowing which news update could make effect to the project refreshes the holders choices.
Consistent activities engages the holder to be focused in what occurs around Bitcoin than to insist on when or when not to sell. Holding to sell when it's about to get bad or after taking a few profit can limit the profits of a holder who aims to hold btc till it hits $1million.