I don't care how clever you think you are, rely on a broker's stop loss function and eventually you will get ass-raped. HARD.
Why do you say this? Do you have a good example? Not that I probably don't agree with you though!
Like i mentioned, bitter experience taught me this.
A stop will hold up most of the time. And then, when you really need that shit to work, price will drop so fast that your stop and your backup stop and your 'i'm-fucked-if-this-stop-is-run-over'-EMERGENCY stop will all be worthless.
Trading with only a stop loss to protect your position is the fastest way to put all of your money in someone else's pocket.
Just. Don't.