For me it's not a lose. The best strategy is sell at the peak and buy at the dip. You never know what's coming so better to take advantage of the ups and downs. But this is only for people who has all day to monitor the price of bitcoin but if you are a long term holder then there's nothing wrong.
I think it just depends on your mindset and your short term needs. For many people, trying to time the peaks and valleys is very stressful, and they often end up buying the top and selling the bottom. If you are consistently losing coins, for example, while trying to lock in fiat gains, it might be best to allocate
at least some of those trading funds towards long term holding.
I've done well as a trader over the years. Crypto adds a new risk in that 3rd party exchange risk tends to be far more severe than with other commodities. It's important to keep this in mind as a crypto trader; don't over-expose yourself to any one exchange.