Its simply the basic principle on that you would be able to accumulate more if the price is lower and less when its high. DCA isnt applicable to everyone because it will really be basing up into someones financial capability but if you are really that being too positive or eager to accumulate Bitcoin no matter what, then you would be finding up ways. DCA method will really be that lowering your average price entry on which the lower the price you have bought the bigger potential profit that you can get once the market will be having that recovery or price pump. This is where some people do always wait up for market corrections (which is sensible thing to be done) before they will really be making up some buybacks. There are those people who dont really care with the current market price and just buy immediately.
Immdediately you decide to wait for the market to dip for you to buy bitcoin you are literally practising trading, that is not investment in any form. I dont agree with you in a lot of things. Anyone can practise the DCA you cant say it is not applicable to everyone. A no coiner can DCA and low coiner can DCA and those who have also reach their target can DCA adding more fractions to their asset. At the same time somone who decidese to DCA or use any other strategy can still buy more Bitcoin agreesively or not by waiting for dips if he has more discretionary income to invest with without hindering the actual method he is using to DCA.
Have you every what happens when you wait for the price to be lower and it never gets lower? You will have no option to wait for as long as the price still remains high such investment strategy will make you not to invest in Bitcoin at all and it is wrong to use it as a permanent investment method.