I don't think this is necessarily the case. Most of my clients dollar cost average by default, as with retirement plans you've normally got money coming in to your plan from your work paycheck every two weeks, so by nature they are dollar cost averaging and not even knowing it. Now if we are talking about outside of your normal retirement plan investing, then I would probably agree with you. But I think most of those times are simply people placing trades when they have the money to do so versus trying to time things.
This is basically what I am doing, my salary is monthly hence why I put money in my crypto accounts once a month, and I have been doing that for a while and it is a great feeling, but the reality is that it is not going to be something special, I am not going to be able to retire and be super rich by the time I am 60 because of 2 reasons.
First of all, the economy is getting so bad that, I would be shocked if I do not cash out all of my money eventually, it is quite possible that I would be selling it all and paying some debts or try to survive because our economy could crash any moment and I would have to pay x10 more for food very soon. Secondly, I am not putting "that" much money in it.