I think it depends on what market you trade, and the timeframe. We all know someone who doesn't belong to the interbank circle, hasn't a chance trading just charts,scalping forex 5 minute charts, move up to the dailies though,(for fx) and there isn't as much that 'isn't known' which could determine market direction, contrary to lower timeframes, and what's there is just a chart with fundamentals, some big levels and a trend. So i think YES for swing trading forex.