Putting up stoploss would only depend if you are really conservative on risk management but using that kind of thing here on crypto wont really be much effective yet 10% volatility wont really be that hard which means single price pump or swing would just trigger your stop loss and what would you do next? Chasing up another entry order and trying to break even. If you do make trade openly you would still have the chance for recovery but still risky yet we wont know on how deep would be the negative would go.
If the guy's a short-term trader like the majority of people that seem to be active here, then stoploss is the only way for them to reliably manage their performance on a day to day. It'd be crazy not to act conservative if you trade daily, no stop loss means potentially just holding more and more of your balance in orders, stuck with them and unable to take advantage of new opportunities when they present themselves.
Long term holders, or trades meant to last months, or even weeks, sure. But one or two bad swings and you're just stuck waiting for the tide to turn, unable to do anything else.