This is a slippery slope mindset, especially for newbies, to either slow down in their BTC accumulation or to develop expectations that they are going to be able to sell some of their BTC and buy back cheaper and to be better off by engaging in such a trading approach rather than ongoingly continuing to accumulate BTC until they have had reached enough or more than enough... which surely it could take a couple of cycles before many guys are even close to reaching such an accumulation strategy that selling some of their stash might even become part of their way of managing their bitcoin holdings.
If a guy has a bitcoin investment timeline of 4-10 years or longer, then many times he is still building his investment for 4-10 years, so quite a bit of his investment had not had any time to grow, unless he might have had been able to front load a decent amount of his investment (perhaps by reallocating from other investments?).
I am not opposed to the idea of selling some BTC on the way up and buying on the way down, yet it seems to me that any amounts of BTC that are sold should be so small that they are without expectations of buying back cheaper... From my perspective, even when a guy reaches overaccumulation status, whenever he sells BTC he should not be expecting to buy back cheaper, unless he really has reached a status that he is ONLY selling clearly and unambiguously from overaccumulated coins.. , which I understand is not a clear description of what guys should do or how they should manage their BTC once they reach overaccumulation status, so guys have to figure out these kinds of formulas so that they do not end up in a situation where they had sold too much of their BTC too soon, which has historically been quite a common theme/happening in bitcoin.
I don't know why some people who are into bitcoin investment has more of a profit mindset than accumulating and increasing their bitcoin portfolio overtime and see it grow constantly till they have accumulated their desired amount of bitcoin. Thinking more of profits can mislead an investor in his accumulation stage to the point that he might deviate from being a long term holder to a trader. When you start shaving little profits, it shows some sign of lack of seriousness in you to grow and build your bitcoin portfolio overtime because you are suppose to be increasing it and not decreasing it. You will also reduce the rate of the compounding value of your bitcoin overtime.
I agree with you that when you have reached your over accumulation stage, it is good to buy back whatever quantity of bitcoin that you sold when there is a dip so that you can continue to maintain your over accumulation status overtime, rather than going below your over accumulation status.
Because their mindset and understanding of coming into Bitcoin is all about seeing Bitcoin as doubling their capital x10 within a short period of time and that is why you see a lot of them being impatient to invest and accumulate for a long-term of 4-10 years or more but rather run to trading which they end up regretting their actions or for those that decide to invest,at any point in time the price of Bitcoin drops they are scared of losing their money, so they sell of their coins without hesitation because of fear, these type of persons can be called passerby because they are not serious and have failed to understand the importance of Bitcoin in their lives and the world at large.