The thing I really like about making bitcoin purchases using the DCA method is that we can focus on other things without worrying that the bitcoins we buy will make us lose money because we only make purchases consistently every week or month without thinking about the price at which we will buy Bitcoin
So it is quite recommended for those who want to implement purchases with the DCA method, you have to work hard in the real world, collect as much money as you can, focus on your work so that you can buy bitcoins regularly without being disturbed by your funds being lacking or running out suddenly
Bitcoin investment might seem tough due to it's long-term characteristics, holding is not as easy as it seems, but some who's determined to take that risk of investing their spare cash on different intervals wouldn't find it tough like others, that's why one must have a steady source from where they get money and invest some portions be it weekly or monthly, the DCA have even made it more easier so far the investor got steady flow of income, except maybe they're ignorant about it that's when they'll see reason to be scared.
One interesting I found about the DCA method is that it makes the investment easier and without both emotional and financial stress, so I don't agree with you that investing and HODLing Bitcoin is a tough task. If it is tough, it simply means that you are not investing the way you should, maybe you are investing with amount you cannot HODL since the money is for some other basic needs. The DCA method actually afford us the opportunity to Bitcoin in a way that it will be easy and without much stress on our finances. It makes the investing easy as one is leveraging on the power of compounding and gradual growth.
Asides the DCA, Bitcoin investment is for those with a steady paying job, not for people that wants to risk their cash to make quick money, someone without a job can't even hold for long cause they'll be forced to sell during time of emergencies, their only hope would be one their investment since they don't got other money therefore it's not advised and whether DCA or not an investor should have a job already.
The DCA method is not for only those with stead cashflow as I have been made to know by JayJuanGee when someone ask the question in early part of the thread. In his response, even though your cashflow is not regular, you can still figure out a way to invest using the DCA method and that can only require you taking average of how often you receive inflow and then make projections from there. You can be in a type of business that pays at least once in a quarter. You can do your calculations from there by first calculating what your basic needs would be for the quarter, then removing the amount for investment and even emergency funds and some reserve funds.