A traders task is not just buying and selling rather it is more than that so it is vital to learn all aspects of trading. Also, there are many traders who in order to get the understanding of market read online which may be partially wrong or correct. A little knowledge of something is dangerous.
What is the task of a trader other than buying and selling which is even the general definition of a trader, the main reason why they came into the crypto market is just to buy coins at cheaper rate and then sell at higher rate as many time as possible. But like you said, in other to be perfect in this, because they are now different from being an ordinary market trader and I think that is what you mean.
There is need for them to acquire knowledge as much as they can because trading of cryptocurrency or Forex trading really require a solid skill and strategies to be able to ascertain when to place an order and when to sell their order. Any trader that jumps into the market to trade without that solid knowledge does that at his or her own risk.