One thing that is so advantageous to retrospectively analyzing DCA is that we can plug in some numbers to see how they play out during such time and get a bit of an automated and standard output.
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I have one thing going on in my mind for quite long i.e. DCA is also a form of lump sum investment. Like if a person is investing 10$ per week then he is like investing a lump sum of 10$ in week one and then a lump sum 10$ in week two and so on. DCA is also a kind of accumulation of Lump Sum investment that are made over a period of time. It's my own interpretation, it may or may not be correct.
You also have a valid point that anyone who invested a huge money several years ago and is ignorant about Bitcoin that he didn't invest at later stage, such are just hypothetical assumptions. The person who is investing a lump sum money into bitcoin is well aware about Bitcoin and will continue to invest in Bitcoin over a period of time.
From my understanding of what DCA is about. You have explained what it means but the major challenge of DCA's investment strategy is constantly regurgitating the investment which I believe is the reason why JayJuanGee brought up the idea of analyzing the plug-in numbers to see how it plays out.
Yes, DCA is the method that is understood and used by Bitcoiners, not rich/naive folks who join the market due to the advantage presented by Bitcoin.