Yeah, but if you did not have any BTC, then how are you going to know to wait before you buy?
Even if you started buying
$100 per week of BTC on December 19, 2017, by now you would have had invested $32,700 and you would have accumulated 2.66 BTC (currently worth about $186k), so you would be right around 5.7x in profits... so there is no reason to be greedy or to be trying to second guess these kinds of matters. The main thing is to get the fuck started and to establish a position, and surely a guy with 2.66 BTC is in a good place right now, but he still might feel that he does not quite have enough and he might feel that he needs to continue to invest at $100 per week or maybe even to be more aggressive in his weekly DCA amount.
I just have a small point that today bitcoin price is around $70k and if we are comparing last 7 years DCA till today then it looks good. But few months back price of Bitcoin was under $20k and at that spot thing might not look as ideal as they are today.
There is consent that some investment is better then zero investment. If I talk about myself then if I have been investing into bitcoin since 2017 then I might be in some good position. But since I started investment quite late so I have to wait for a while to see my portfolio in good position.