There is nothing wrong with selling for short profit and to buy at the dip again and there is nothing wrong to hodl for long, it all depends on individual target goals. At any point, stay with your goal. The reason that some people regret on their investment is because of greed, they shift their goal post at the middle of the game. Bitcoin is a very volatile asset and when the bull comes with, it looks as if it will continue for a long time then you change your target plan to higher price but without recourse to correction on the price action that had already happened. After that correction, price may not get to your new target for a long time. So stay with the decision made earlier before investing, that's being discipline in investment.
I think I agree with your philosophy, I really do not think there is anything wrong in selling for short profit like you put and buying at the dip again, somehow that's a good strategy that most people ignore but has proven to be a good strategy, though a lot of people still prefer the long term plan as they intend to wait to see when the market is favourable (when the value increases) but all the same, everyone is entitled to their own opinion and plans pending on which best suits them because everybody has a different perspective concerning this very topic.