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I agree to what you are saying here, selling part of your bitcoin or all of your bitcoin during your accumulation stage should be discouraged greatly because it's the fastest way to wreck your investment and make you miss that great opportunity that lies ahead when investing in bitcoin, so no matter what, if you have not gotten to the end of your bitcoin accumulation, don't ever sell part of it because it's not a healthy practice.
You might decide to take some profit if you have gotten to that over accumulation status, but if you haven't gotten there, don't ever sell.
Some people really don't understand what Bitcoin investment is all about else they'll be doing it the right way instead of the other way round, I see no reason why someone would call themselves an investor without the thought of long-term one of the qualities of a true investor is patience and if one doesn't have such quality then the person is not qualified to be called an investor.
So far one has made up their mind to invest on Bitcoin you must be determined to reach your target and by then you must have over accumulated then decide to take some profits, taking profits when it's not due it comes with regrets, cause such investor would miss out on better opportunities in the future.
Yes, I agree with you in this the reason why some folks are making mistake is due to lack of knowledge and understanding and this is as a result of what they are being told about Bitcoin which is not true while some are due to misconception of what they told them. That is why it is very important whenever we are talking about Bitcoin we should be very careful to state it well and how it works and we should not also call Bitcoin cryptocurrency as this can mislead newbie and some folks that are not yet grounded in this journey or space because I have seen a lot of folks still classifying Bitcoin as cryptocurrency.
Mate, there are folks that also understood what is Bitcoin and how it works but they choose short term profit and that is to their own detriment but the right thing to do is to invest with long term mindset and stand by it because the future of this asset ( Bitcoin) is very promising.