According to what I have learnt so far the reason for DCA is to relieve or save yourself from the stress of not knowing when to buy, since bitcoin is volatile The practice changes at any given time so now the DCa help you to buy
Btc at any given time basically weekly. Sometimes you
May buy when the price is low and also by when the price is high. When you buy in some week it is low you are indirectly replenishing the lost value when you bought higher. So DCA is the best sofar in investment strategy it's a middle man between dip and HODL and lump-sum.
DCA is definitely a great collaborative tool, but it's very difficult to use it properly. The reason is that most people make mistakes in regular investment. In this case, it seems to me that there is no problem with the DCA method, the problem is with our decision here.