Investments, especially DCA, should be budgeted in advance from our income and must distinguish which one is used as an investment and which one is used as an emergency fund, do not let it be equated because in my opinion the calculation becomes a little troublesome if it is equated and can interfere with each other's needs both in investment and emergency funds that are prepared.
Lack of preparation is what will make an investor have problems on what fraction from his income that he will assign for regular DCA. It is not a healthy practice for one to equate his emergency funds and investment funds, especially when you are investing in bitcoin. It is only someone that lives where everything is provided for him, that is when you can think like that because you have less expenses, but still you will need an emergency funds to take care of some personal things, like if you have a girlfriend, going to have fun and so on.
It is expected that our emergency funds should be higher than thye one that we are investing so that they will be no ugly suituation that will make you go and sell from your bitcoin that you are buying, this shows that you are ready to continue using your DCA pattern to keep on accumulating till you get to your bitcoin target. We need cash to survive and we need our investment to grow for a better life in the nearest future or at old age, this is why there must always be a reserve of emergency funds to take care of whatever should be taken care on, your investment can keep on growing as you keeping on DCAing.
Lump sum buy bitcoin one time and then completely forget it for 20 years.. that's pretty inactive and it might even give that person a lot of peace of mind to just not think about bitcoin for 20 years or whatever might be his/her timeline.
Don't get me wrong. I do think that DCA is the best for an overwhelming majority of normies.. but people are surely free to choose their own variation of systems and even truly/sincerely believe that it is better for them.. and perhaps they are correct in terms of their personality and/or their financial circumstances.
I understand what you mean, because as long as you are happy with how you invested your money in bitcoin, and holding your long, you will be peaceful because you know that you will make good profit at the given period of time. What I see in the DCA pattern, is like you said the active buying of bitcoin, no matter how long it takes you to continue buying, maybe ten years or more. Another reason why I like the DCA method is that it create room for you to see reason why you need to increase your bitcoin portfolio from your initial bitcoin target because, you will become use to assigning a certain amount for regular DCAing, which will become part of your weekly, or monthly practice. DCA will also give you a proper insight of bitcoin market for you to come up with a strategy on how to be flexible with the market, irrespective of the price of bitcoin, as long as you keep on accumulating.
For instance, an investor can come up with a DCA strategy, that if the price of bitcoin is at 20k-25k, he will use 20% for DCA, at 26k-30k, he will use 15% and at 30k up, he will use 10% and so on, because he has a fixed amount of money assigned for DCA. While people who buy at dip, don't have much practice in their buying, just only to follow news and keep on expecting for the dip, that they don't know when it will come, or the people that buy at lump will only buy once in a while based on when they have accumaulated enough cash that they feel it is that for them to buy again.