Well said.
This bores down to the investor own unique financial bearing... which affects his profitability and portfolio.
Withdrawal doesn't obstruct portfolio building, withdrawal is about taking profits made, if the investor have realised a substantial gain or % rise in his portfolio, he can decide to sell wether in a favourable or unfavorable market condition As far as it aligns with his plan, decision.
An investor, invests because he wants return, the return made is subjective to the investors choice, not necessarily a particular "selling strategy".
There are many who are not patient. And cannot handle greed. For example, there are many people who sell some or all of their BTC after investing, as soon as they see some amount of profit in their portfolio. These cannot be called investors. Investment is long-term, such as keeping a time frame of 2 to 3 circles. Those who do all these things are called short-term investors or traders. Many new investors think that short-term investments make a lot of profit. In short-term investments or trading, the possibility of losing your money is very high. In long-term investments, you do not have to worry too much about small market declines. The amount of risk is much less in long-term investments compared to short-term investments. Always keep yourself away from short-term investments or trading. Then you do not have to worry too much and the risk of losing your money will be much less.
Everyone certainly has their own reasons for selling when they have seen profit, but of course this has changed the planning they have made before, but if only they could still hold on longer according to the plan when they bought, of course the profit they got would be greater than selling now.
I agree with you to avoid trading as a beginner because the risk of losing the money we have is very large, but when planning to hold it for the long term, of course we have to make good plans and continue investing until we reach the profit target we want.