Actually, for things like this it depends on everyone's thoughts and strategies, we cannot consider it wrong or right in this case because everyone has their own perspective.
But when talking about bitcoiners of course there may be special specifications about this and those who sell certainly for some people will not be considered bitcoiners.
Although in this case they have their own perspective but they also cannot determine the perspective of everyone who judges them.

Besides that, selling and then buying again when the price is high does sound reasonable and seems very doable but of course things like this will not be able to be done by everyone because it could be that when selling we can't buy again because the predictions made are wrong.
So when you don't have the qualifications there it is better to stay with the bitcoin you have than to sell and buy again when the price is cheap but we are still worried about the choices made.