Surely there is nothing wrong with buying on dips, but a person who has a tight budget might not really be in a situation to change the amount of his weekly-ish investment into bitcoin, so he might well be buying at any price until he works up a bitcoin holding that he believes is enough or more than enough.
I agree with you on this, because some investors can only afford a particular amount as their discretionary income which that is the amount that they can only continue using to purchase bitcoin regularly, and when there is a dip, they only wish that they had more to buy at the dip, but nothing changes as their regular DCA is ongoing.
DCA is good, but if one is in the position of mixing it with buying at the dip, he will achieve a better result compare to doing strictly DCA, but it is not everyone that is at the position to do so, and that is why one needs to look for a means in order to increase his income so that he can be capable of taking advantage of the dip when it comes. People that have jobs, and don't have a means of increasing their income can save some extra funds that comes in that is not part of their salary, funds like bonus or traveling allowance and so on. This will help to buy extra during the dip.