Although there is nothing wrong in waiting to buy the dip if you have discretion income to buy at any given time. Or if you are combining other strategies. The only problem one can face is only focusing in buying Bitcoin dip without consedering other investment strategy. Because there is alot of people that only want to buy bitcoins when it is dip as a main priority and forgets to buy through DCA, in such situations such person can be considered missing opportunity.
It would still bring results in the end, if holdled appropriately.
However, the PNL may be smaller than by doing DCA. Or bigger.
Depends on the market, the person in question, and the time that was passed by.