I guess you have a little experience with trading which is the only reason why you can be saying stop loss is not needed in it. Perhaps you are trading only Bitcoin and other slowly moving markets that might be active without threatening your account, you can't dare to do this with other asset classes.
If you're an active trader and does trade while actively looking at the monitor of your laptop then you don't need stop loss. You're active so you can exit the market if you don't feel comfortable with the price movement. Stop loss has its disadvantages. It not all positive because cryptocurency whales manipulate the market by causing a false buy signal or sell signal on the market. If your stop loss is at the price that whales false sell just to trigger the market to start dumping, you'll get affected meanwhile the price isn't dumping but increasing.
For any trader that's not active then making use of stop loss is very important, it doesn't matter if you're trading a less volatile market like Bitcoin, you still need the stop loses to prevent yourself from suffering huge losses. Bitcoin also has moment when the price falls very fast.