As nothing is actually ever simple in this world to do especially when it comes to field of financial stability same thing applies to actually successful holding your Bitcoin and it's another case if you are accumulating through DCA, why? Well because it's not an easy task and most people actually just give up at the long run of it because of so many reasons and here are some.
---lack of discipline
---wrong financial income or none at all
---No proper planning
--- procrastination
--- impatient
Before anyone can properly practice DCA and still hold on to their investment for a long period these certain barriers are to be broken.
It seems that you are getting DCA mixed up with other kinds of investing (such as lump sum investing), because DCA overcomes each of those items in your list because once you get started, then DCA makes it easy to overcome each of the items, because all you need to do is pick an amount.. $100 per week set it and forget it..... and if you think that $100 per week would cramp your lifestyle too much, a different amount could be chosen.
Of course, there is a need to both set up the DCA and there is a need to figure out what the amount is going to be, but there are ways to do minimal levels of work.. and then just let the investment strategy ride for several years, and sure maybe after a few years, there might be some needs to look at how the investment is doing and then to reassess whether further actions might be needed, and if the amount is starting to add up to a lot, then having stake in the game may well motivate further activism in regards to the investment.