I don't think there is any need stressing which method is the best and saying that the DCA method is the best does not really stand because their is no data to back up what you are saying. For instance, can you name any of the big holders of Bitcoin that bough using the DCA method? But I know many huge holders that do not buy their Bitcoin through the DCA method. I still remember when MicroStrategy were massively accumulating Bitcoin, they bought using lump sum method.
I don't care if any big holder of BTC is using DCA or not, because we don't have to idealize if the method is working or not, just because big holders have adopted it or not. We should have our own senses to idealize things. DCA is the best method there for long-term investments. And speaking of Microstrategy, you tell me, did they buy all these 226 331 BTC all at once? No, they did not buy it all at once means they did not lump sum it.
But their one-time purchasing is of millions which we think is a lump sum but according to them, it's not.
https://saylortracker.com/ look at the site, and you will realize how many times Microstrategy has bought BTC. And was it beneficial for them? Yeah it was beneficial for them to buy at different points.
The most important aspect in Bitcoin accumulation is not the method of buying but how to hold and manage the Bitcoin purchased. Some might buy using the lump sum and at the dip but will be unable to manage it properly, thereby selling when the upward movement is just starting. While some people can buy at the beginning of the movement but will hold even to the peak of the movement.
You are wrong, if you are accumulating BTC you are doing it because you want to profit in the long run, and I know a small difference won't make big impact but just look at the link I gave, if MS have bought all those funds all at once they would be more beneficial (if bought when BTC was around $25k) But they did not buy it all due to reasons. Point is entry point do have big importance, along with the managerial aspects.