You sound lost Bravut. Of course withdrawing bitcoin is the same as selling, so if guys are taking too much profits too soon, then they surely could end up screwing up their bitcoin portfolio building and never making any progress in regards to really getting their BTC holdings up to a high enough level to really profit from being in t bitcoin.
I agree with you JJG, selling too much Bitcoin when one haven't gotten a good number or fraction of Bitcoin in there portfolio is not good because sometimes after selling you won't see the need to invest again or sometimes you won't see the opportunity you were hoping that made you sell your Bitcoin, selling is not actually bad per say but as a low coiner or a beginner you don't have or need to sell your Bitcoin but for someone who have hold for years and has a good amount can sell but not up to 10-30% of there investment because our portfolio will not look nice and one funny thing about Bitcoin investment is that selling can be so easy but buying back an holding can be very hard that is why we shouldn't sell a high percentage of our investment.
investors should also understand the concept of buying back into the market, just as you have said can also be emotionally challenging, especially if the price of the market has increased significantly, and this has caused many investors who have found they're self in this problem, some investors are regretting selling to early and not holding onto their bitcoin long enough.