When we are talking about buying at a dip, it is mostly the average investors that waits for a dip because their input is little therefore he will look for a time when he will buy at a more dipper price, then the rich doesn't even care about a dip because they are dealing with huge amounts of money of which they know that they will make some profits in it and they don't even DCA as most of them prefer buying a particular amount of Bitcoin and doesn't accumulate further but the average man uses the DCA because his investments is not in large quantity so it would take some time before he can accumulate as many as he wishes to using the DCA.
I think you are misunderstanding the concept of buying the Dip because is not only the investors that has smaller capital that utilizes the opportunity when the price is dip, so perhaps in most cases investors that has large capitals are the ones that utilizes the opportunity the most and not because they are not following the DCA method but but because they strategize themselves in such a way that they keep a certain amount of funds so that if the price dip they can accumulate as much as they can while there DCA are still running, so I disagree with you on the aspect you mentioned that is only the average investors that utilizes the dip, however one thing you should know is that Lump Suming is another word for investing huge when the price dip and is mostly done by most investors who has a large capital so they always utilizes every opportunity when the Bitcoin price drops.
Yes I agree with you completely and another thing is that the dca strategy is not also only limited to the average man that doesn't have much finance the dca are use by both the investor that has much and the investor that didn't have much. In as much the dca has enormous benefits one the major aim of the dca is to mitigates the short term Price volatility by buying at different price point.