Most traders know how to stop loss and the newbies aren't the ones that uses it because they're confident about what they do. But take it to the professional traders.
They know that the market is unpredictable and that's why they set it around a few percentage of losses and they'll set the stop loss so that they still have that much to switch into other trades.
the use of stop loss will set how much loss will be cut when it reaches a predetermined limit. but some beginners still don't use it so it will be fatal for trading. spot trading may still look safe if you don't use stop losses, but if futures trades don't use stop losses it will allow for faster liquidation.
As they trade, they think that they're good with those few wins that they take and that's why confidence will make them lose a lot of money.
And for the futures, honestly, I am seeing more traders losing money there, newbies and even those that are old timers.