Hard to hold when you have nothing else but the BTC you have and if there isn't anywhere you could get money for your everyday needs, you will be forced to sell at a low price instead. It happens to many people including me. The economy caught us off guard really so if its possible to get two jobs while you invest a little of your income to BTC will still be worth and this is where you really can hold confidently.
Therefore, when we see that hold is very difficult to do, we are advised to use idle money, or free money. because our economy does not know the future, so when we need money we are not burdened because we hold