I don't think waiting for the dip before accumulating Bitcoin as a good strategy, for there is no need waiting for the dip before accumulating Bitcoin as it is not necessary or important when buying using DCA method.
For me I see buying only when the market is DIP as trading. With your DCA strategy you can accumulate more Bitcoin regardless of the price either weekly or monthly as the case may be.
Buying only the dip strategy is not only done by the traders, those that has gotten to their maintenance level in their accumulation journey can also adopt the buying the dip strategy as they may not longer need to be buying frequently with the dca strategy but may decide to only be buying the dip comfortably.
but looking from the perspective bitcoin buying a dip in an uptrend seems to be a good idea... I wouldn't give it a trading option only too as its a strategy to buy more with less fund so it's pretty much a good strategy just that the "only" attached is not suitable for beginners who have no reasonable amount yet waiting for dip could just be the most stupid that could be done 