There are many investment strategies and you can choose one strategy that works for you or combination of some strategies with different parts of your investment capital. If you don't want to have headache, you can simply use DCA, but if you afford to follow up the market and want to find better prices you can wait for dips. Time the market, find the bottom (best price) are difficult so "Buying dips" is good if you apply this strategy for one part of your investment capital. I still think your main capital part should be used with DCA strategy, not with "Buying dips" strategy.
You can buy with the DCA method with some portion of your capital and keep a small portion for buying the dips. This is what I understand as effective way of buying the dip.
I agree with your customized strategy because dips can happen or not and in a bull market, dips can occur after a long time like several months of bull run. So waiting for dips in a bull run does not always give you better entry prices.
Waiting for the dip before one can accumulate Bitcoin is a wrong strategy expecially to new Investors, applying the DCA strategy also makes you to accumulate Bitcoin even when the price is at dip because with the DCA strategy an investor can accumulate Bitcoin irrespective or regardless of the price of bitcoin.
One of the disadvantage of waiting for the dip is that it will slow down your investment process because such person won't be accumulating Bitcoin now that the price has increased, the dip should only come as an opportunity to have more bitcoin to your portfolio for you can even accumulate aggressively without overly doing it if their is back up funds to accomplish it instead of regularly waiting for bitcoin price dip to your expected price before accumulating Bitcoin.
That what he said is not sustainable actions since its like he's going to trade his Bitcoin for short time. Since thinking about waiting for dip is sounds like they are not stable on their investment decision on Bitcoin. So if they really want to engage with stability and doesn't get any issue while accumulating they better buy at what price reach by Bitcoin since this provably give them good convenience compare for stressing out their selves for waiting on the dips which they don't know on when it will happen.
Common situation will happen is they might slow down or worst they can't accumulate at that time. So we should choose the best approach since with this we provably engage on more convenient strategy which is more suitable for us to survive for long term with Bitcoin.