DCA'ing most not be for everyone but to those who are yet to take a final decision to buy at a go without having the mind of doubt that it may go dip or higher at this point such person(s) may decides involving themselves with DCA. Then if you think the price won't come down or won't dip anymore and you have the available funds to invest then buying at a go is also better because if you don't buy at that point you would end up regretting maybe you have to wait till further noticed when bitcoin price dropped to price you missed.
Lets take for instance, first week of last 2 month if someone purchased a bitcoin at a go without doing DCA don't you think such person could have made about 5 to 10 percent of their investment? Yes this is true but the person who is doing DCA may not have that profits because s/he ends up accumulating very little fraction of it.