1; It allows you to grow your profits by gradually without everything you earn, e.g. If you make profits if let's say $500 you can risked $50 from it to chase more profits by using stoploss to that effect.
2; It allows you to control and check your drawdown to minimum, personally I hate d rawdowns above 20%, so i avoid it at all cost by planning my trades with stoplosses well placed.
3: It allows you to have a very good money management.
4; With stoplosses well placed, you can always control your emotions of not letting floatings of huge negative openings.
5; You don't have to worry about spikes, as your accounts are protected by it.
6; You can always plan and know how much you stand to loss if things goes opposit, and if you are not kind traders that stays full staring on their trading computers all day.
7: This is my favourite part, Stoploss can actually allow you to risk very little and gain more if only you are a patient trader and always plan well. E.g When you have $1k, You can risk $50 and target to earn $250 and above or Risk $100 and target 500 and above.
Questions are welcomed