As Scataphagos said, stops are crucial, and placement is an art. Whether hard stop or mental stop may be a debatable topic, the crucial and art characteristics still apply.
Given that, I use a catastrophic standard (not limit) hard stop on every trade. It's purely money based and meant to protect me against, well catastrophe... power/internet outage, black swan news, hardware failure, spilt coffee on the keyboard, dropping dead at my desk, etc. A catastrophic event. MY CATASTROPHIC STOPS ARE RARELY, LESS THAN INFREQUENTLY, HIT.
That brings up another debatable topic... Because you have a stop in place does that mean the stop is the only way to exit a wayward trade? I say ABSOLUTELY NOT!! Same applies to hard targets imo.
During the early (the first 1, 2 or 3 price bars) management of a trade I use a mental stop based on volume, structure, and price action. Trade management stops are ALWAYS significantly less risk than the catastrophic stop. If things are not going as expected, first if I see a possibility, I attempt to exit at BE+1, a true wash trade NET. Otherwise, I exit without reservation. If going as expected I again use volume, structure and price action for placement of a standard (not limit) hard stop. This is to prevent an acceptable profit from turning into BE or worse, a loser. The trick here is YOU must determine what acceptable profit means based on your trade expectations and style of trade. I do not use RR ratio for (my) intraday trading.