DCA method should be done in such a way that only money has to be invested in Bitcoin, and this investment has to be for a long time. There is no thought of selling bitcoins from this investment. But usually this Bitcoin DCA method will follow the basic needs of the family and with the extra money, because the more the investment, the more profitable it is because in the future the price of Bitcoin will surely increase several times more than the current price. Note that those who have done the DCA method since 2013, and have played holdings have accumulated and held the highest Bitcoins ever. So if you want to hold Bitcoin then you must hold Bitcoin for a long time and keep investing regularly.
And therefore, someone who wants to commit to doing DCA needs to manage their finances more measurably and has prepared carefully the funds that can be set aside for consistent investment. Because in DCA, you cannot invest today and then sell it a month or several months in the future, the investment you make must be in accordance with the target you have previously set, so until the target is achieved what you need to do is keep holding and investing regularly. The key to DCA is consistency, and people who are consistent in this will be able to reap the profits as they expect.
You are right, when someone wants to run the DCA method consistently, they must be very good at financial management and they must also set aside funds for their emergency needs so that they do not have financial problems when running an investment that makes them have to take the funds they have invested.
I think everyone has understood well that the DCA method is a long-term investment that requires them to continue to accumulate their Bitcoin assets until they reach the target they have made, because if they cannot maintain their assets in the long term, then it is likely that they will not get the benefits of what they have invested.
What you have said is very appropriate, it will be very profitable for those who can run the DCA method consistently, they will make a profit from it, but for those who cannot survive, it would be better for them to be able to manage the income they have earned well so that they have the opportunity to run the method well.