You seem too committed to the DCA method that you tend to have forgotten that there is another method of buying called buying the dips. There is nothing wrong with setting aside some funds to buy when price dips and when waiting, using the DCA method to continue buying without stop and waiting for the dips to buy lump sum. This is a kind of combined method which is very effective. I think most experienced investors apply this method and I recommend the method for anyone who want to fully take advantage of different market conditions.
I can only talk from personal experience, I used to take this hybrid approach dca and bftd, but when I went back thru my data and calculated the difference from pure dca and this hybrid approach I found it didn’t quite pan out the way you are saying. The main problem encountered and not all the time but most of the time you don’t get the dip properly. It’s very hard to hit the dip without a lot of eyes on glass ie time. Yes you can set orders but then you have to divide up your dip money to guess where it lands and sometimes you have leftovers. Instead of bftd I increase my dca amount for a set period of time and then bring it back to normal levels. For example for the next 4 months I increased my dca amount. In July it will go back to normal levels.
The second problem is outside the blockchain, you got a little nest egg for dips but then things come up trying to nibble on the egg from rl. Yes there lots of strategies to insulate and segment your money but the majority of people don’t have these in place. If you don’t have an emergency fund in place I would not recommend trying to bftd strategy.
I’m absolutely not saying your wrong but in my own experience I keep coming back to the old adage; “Time in the market instead of timing the market” Pure DCA let’s you accumulate methodically and increase your time in the market without any timing requirements.
Thank you @Greyhats for sharing your personal experience on this and I want to tell you that I agree with you on the negative part of the 'hybrid system' like you called it. Reading through your comment I realized how stressful it can actually be to monitor the price regularly with the intent of looking for the dip in which the perfect is never easy to locate because what might appear as dip now might just happen to be the beginning of the dip few hours or few days later. I have been there and I can confirm that it is a strenuous process that often messes with my head (psychology).
On a second thought and in agreement with your comment, instead of the stress, one can simply use the DCA method and achieve the same result or something close to it. Due to the fact that I got a lot of BTC at very good prices when I applied the method, I have suddenly forgotten the stress that came with it like how many times I had to stay glued to the charts, how often I regret buying when I bought instead of waiting a little further and also why I didn't buy when I would have gotten lower prices. The process is never without challenges and some form of luck. This is why I have come to now understand that the DCA method is just enough.