its depends on your style.. if youre an investor your strategy really is HODL for long term but if youre a trader ofcourse youll trade when you already have profit and just buy again at dip
This. For some people who arn't good at trading, holding is the best strategy. They lose money trading (not least on trading fees which add up over time).
Indeed, for someone who doesn't know the science of trading then it's advisable to HODL, but for a trader he will choose trading to gain profit. And they have all considered, including the fee incurred. For those who lost money because of trading he most likely didn't have much knowledge about trading.
Everyone has a way to earn money, moreover in cryptocurrency especially in bitcoin who have volatile prices. Opportunity will always exist if the price will keep moving and the trader will always use it. Sorry I'm a trader, and being a trader risk-taking is his job. You must try to become a trader, and you will feel it.