I didn't say that greed is not a problem in trading. What I am trying to say is that even if you remove greed in your trades it's not a guarantee that you will become successful in trading because there is no strategy that works 90%. That's why it is very important to have the risk management in our trades because it is the key to success. It's a highly recommended to add it in our plan.
There is difference between risk taking and been greedy trader. If you are greedy in crypto trading, you will lose much more than you are going to make here, I have seen someone short sol and was profited, like heavily and instead of closing that position, he held the short until Solana rise back and hit all time high, he was liquidited and lose everything again.
Assuming he was able to control his greed and didn't let greed consume him, he would have take the profit and change the sentiment of the market from short to long, always remember that in trading, the trend is what gives you money and not what yiu think about the market.