Investing in DCA method is a method of maximum savings, it is proven that the person who invests in this method has achieved great success. Because if the price of Bitcoin increases even if he invests regularly, the method controls the average price ratio. And while the price of Bitcoin is low, the average price controls two. So in whatever way you think this DCA method is the best, the more long-term Bitcoin holders there are, the more nearly everyone has had success using this method.
I don't there is any method of buying bitcoin that is best for everyone, what may be the best for you may not be suitable for another person. So you see, the method any individual uses to make his bitcoin purchase does not really matter and depend on his/her preferences and what really matter is what the investors do with the bitcoin in terms of preserving and protecting it to derive the best value from it. I can decided to use the DCA method to buy while another person use lump sum, in the end we both have bitcoin in our possession and as long as we plan to hold our portfolio and not sell under pressure or when we do not plan to sell, then we both will be achieving equivalent results.
The DCA method seems to be favorable to many investors simply because it is easy to apply and can make one easily develop the right discipline needed to hold bitcoin for long term. By this I mean, those applying the DCA method seems to think more of long term plan rather than just buying low to sell high. The DCA method is a process of its own that requires patience to follow, this is why many people using it tend to achieve good results.
I disagree with you here, the DCA method is the best when it comes to acquiring Bitcoin and the rewards you get long term, because the lumps sum method you mentioned is only waiting for the market to deep before he thinks of buying, and most times you might miss and opportunity to buy at a lower price, because you thought it's going to go deeper.
I do not know what you mean by the best because everyone uses method that is convenient and suits their purpose. If you say that the DCA method is the best, are you saying that investors like MicroStrategy and other whales that do not use the DCA method are not doing it correctly? Many of us are aspiring to be like them, buying bitcoin when others are afraid and being skeptical, and holding for long term. That is the ultimate goal. The method of buying should not be the borne of contention rather how best we can manage the assets so acquired to be able to be proud of our decisions and actions in the future without any form of regrets.