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 inve. sting a lump sum money into bitcoin is well aware about Bitcoin and will continue to invest in Bitcoin over a period of time.
It appears to me that you don't know the difference between dollar cost average ( DCA) and lump summing because if you do..., you wouldn't be saying that DCA is same thing as lump summing and in case you have forgotten i will let you know the difference between them. DCA method is a weekly or monthly approach in which an investor can use to accumulate his or her Bitcoin investment while the lump sum is a method of Bitcoin accumulation in which an investor buy Bitcoin in a large quantity which can either be ones, twice or more in a year depending on the investor capacity and remember lump sum can not be done weekly or monthly but if is it been done that way then it becomes a DCA method and DCA can not be done or is not suppose to be done ones, twice or more in a year else it becomes an inconsistent investment. Some people do not invest lump sum in Bitcoin because they are fully aware of what Bitcoin is all about rather some people like trying things.