You can use stop loss as a backup plan especially when you are doing a scalping on a particular coin, it is really a good thing that you can do in order to prevent huge losses. And based on my observation most of my fellow members on trading group on telegram they are mostly using this method whenever they aren't able to monitor their trades from time to time.
Yeah, it's your safety net in case your trade don't go as you want it to. Makes trading a bit safer if you with minimal losses if you'e utilizing this tool. And everyone who's trading should be aware of this feature to avoid massive losses due to unanticipated drops in coin value.
I am not a full time trader and it is not many times that I got the chance to sit on my pc 24/7 to monitor trades or even make use of my mobile phone to do so, what I just do is to setup my stop loss and take profit and the system does the remaining job for me.