Always? Guess you've never had a stop missed by an overnight GAP. Or slippage.HOGWASH!
You ALWAYS know how much a losing trade will cost... it's called a "STOP".
You NEVER know how much a winning trade will bring... unless you're naive enough to use "targets".
And no, you don't need to have >50% winners if your wins are bigger than your losses. But wouldn't it be better to have 55-60% winners than 40% winners if you could orchestrate it?