The only coin that should come into the mind of any investor when it comes to coin selection concerning the DCA method is Bitcoin, some investors might want to buy some Alts they feel have potential and DCA with but they're wrong cause you don't DCA using other coins but Bitcoin infact most of those other coins got short-term goals whereas Bitcoin is for long-term investment purpose and that's why it's best for the DCA method. The worst thing an investor would do to their portfolio is to buy and hodl a shitcoin then implement the DCA method on it, that's something the investor would so much regret and might even get depressed cause you'll watch it dumping rapidly at some point. This is something I've experimented in the past, I've held several shitcoins topped up after several intervals and regret was the case so I'm talking out of experience, investors should only buy Bitcoin, hodl Bitcoin, DCA with Bitcoin for investment purposes.
such a situation is very possible for shitcoin players. I'm sure they don't actually plan to do DCA on shitcoin assets. but the situation and belief in their analysis make them fall into a deeper hole. such as buying a certain shitcoin coin and when sometimes the asset value drops quite far. because of the trust that may have been had in the asset, the investor actually buys it again when there is a decline in the hope that when there is an increase it can cover the loss.
I agree with you, DCA is the best way to plan long-term asset investments. don't use it for other assets, especially shitcoin.