I also think like that because logically, people who are trying to collect Bitcoin and hold it for a long time don't immediately think about selling in the near future, so it is very feasible to use the DCA method in that case. Meanwhile, trading is a very different job from collecting because the people who trade in the market are people who are targeting profits in a short time or quick profits in a certain amount so it cannot be compared to people who are collecting Bitcoin by run the DCA method.
Clearly, trade and DCA have different meanings.
Trading has a high risk of short-term profit and you are like risking your money in the market, when the price goes up you profit when the price goes down then you will lose then it is trading.Accumulation with DCA has a very low risk, in fact I dare say there is no risk if you do not sell bitcoin midway due to emergency needs.
With DCA you can have an average price because DCA purchases all the time from the price going down to going up if the time is for the long term then it will continue to do that task if you are still able but I believe using DCA in the future will have better results than trading.
Perhaps this is the reason why holding is the best because it allows you to have a rest of mind and free from emotional troubles of having to lose your funds because of trading, actually considering the risk involves on Bitcoin trading I wonder why most people always choose to trade because irrespective of the little profit they will get from trading or if at all there would be any, it can never be compared or measured with there Bitcoin investment if they will hold it for a long term. However DCA has been very helpful in guiding investors on the easier ways to accumulate Bitcoin.