We always need to wait before deciding because it would help us to realize the best option we could have. If we would buy now and tomorrow the price of the cryptocurrency would fall all we could have is loss so we always need to think before we decide.
I don't see waiting as some thing a crypto currency trader need to always use because time is an important factors in crypto currency trader ans investment but I choose knowledge than waiting because if ones have the require knowledge such person will know when to buy or not.