As long as things are not going according to plan which you already had set out before entering the trade, it is better to get out and then look out for another entry. I know a lot of people tend to be a whole lot skeptical when it comes to the use of stop loss, but in the real sense, without it, you are easily going to be screwed.
These exchanges started using Stop-loss because a lot of peoples who are not that aware about trading feels it secure to make their profits come true. Stop loss is usually meant for those who cant decide whether the coin is going to dump or pump and in such situation peoples prefer setting up stop-loss to instantly sell their coins if the price touches the stop-loss price.
Exchanges have done great introducing stop-loss into them.