I think that choise of tight stop-losses depends on the trading strategy. And tight stop-losses don't fit for long run when you must waiting for a long time for to take profit. Tight stop-losses are good when you want trading on a small trands.

Do you believe tight stop-losses cause losses in the long run?

I only trade with a stop loss. It is very risky to trade without them, the market is never stands and never can exactly say with certainty what will happen in the next minute.

Do you use stoploss?