I quiet agree with you because the fact is that DCA knows kind of investment plans doesn't work for shitcoins because some of these coins the growth rate over a given period is very low so in terms of bringing back value on investment is not there so applying DCA to such investment will be wast of time
Actually the DCA method is always suitable for buying any asset in terms of investment, but it will be more useful if the method is only used on assets or coins that have been proven to be good like Bitcoin so that the steps we take are really useful in the long run. Because in general the method is to buy with the ability that we have so that it is not at all burdensome for us as buyers, but if we do it on coins that are not good, of course the method is useless because we apply it to the wrong assets. So just use the method in collecting Bitcoin and consider it a smarter investment step than our own life.
It maybe generally used for any suitable asset but it doesn't mean that its also good to apply on some shitcoins out there since they are just wasting their money also effort if they think about paying some attention with those scams.
If they used it for those ideal asset like Bitcoin then provably that they will never be wrong from applying that method in that coin.
This method will really be useless if those scam devs do their rug pull schemes that's why its better avoid doing shit stuff with those thing and just better focus on more realistic investment with Bitcoin.