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This practice is bad and should not be supported especially in a thread like here where there are many newbies and potential investors who are seeking information on how to go about Bitcoin investment the right way and not make mistakes. If we support people to sell at the sight of profits with the hope of buying them back, a lot of them will run into problems which will eventually cost them pain at the end of the day. Why should we support short term buy and sell when holding for long is the right way for better profits and more peace of mind. If we encourage more people to adopt the DCA method of accumulating Bitcoin and holding for long term like a decade and above, we will see more successful, rich and happy Bitcoin investors in the future. I think we should focus more on this than anything.
I think trading BTC certainly won't be detrimental as long as we use a dedicated trading fund. Using a dedicated fund will certainly make us more comfortable. For example, if we buy BTC at $120,000 and then, after buying it, for example, if it drops to $115,000, we certainly shouldn't sell it until we've made a profit, even if we wait four years. So, I think the biggest pain in BTC trading is using money they can't afford to lose. If you use money you can afford to lose, you'll usually feel calm, even if it's just trading. Those who consistently encounter difficulties and losses are those who no consider trading a side hustle. So, of course, it depends on how we manage it.
If you read my comment again, you will understand that my emphasis is on the topic we are discussing here which is buy and hold. Even though trading is good for those who have mastered the art and have gained the relevant knowledge and experience, I will never recommend trading for people who are just starting their Bitcoin journey, it will not end well for them and they might end up becoming frustrated. Besides, this thread is not dedicated for trading, so why should we dwell in trading here when we should be discussing how to build a Bitcoin portfolio.
In addition, and like I said before, we have so many newbies here, they don't have to start with the wrong information about Bitcoin. Check the testimony of those that started with trading and see that most of them have terrible stories to tell. Some of them have left Bitcoin while some regret not holding those Bitcoin they traded away. My biggest achievement started when I adopted the DCA method; it made life easier for me and the Bitcoin accumulation became interesting to me.