I see it differently. Especially for newcomers to the market DCA is a top strategy to build up a stock of coins. Both if the person plans to invest money in the long term (savings plans, ...) and if you want to invest in a coin with a fixed amount (eg 1.000€). Emotions play absolutely no role here and you can not make bad purchases (if you stick to the plan, of course). This is a massive relief, especially for newcomers to the very volatile crypto market. I have seen enough "newbies" who got out after the smallest losses and missed the chance for big profits.
Emotion does not play a role while buying, but while hodling. I agree that a newcomer can accumulate bitcoin despite the volatile nature of the market, and that could be achieved by doing DCA. Emotion does not play a role and there are no bad purchases if we stick to plan, that's right. But DCA does not give you profit instantly. You need to keep Hodling till it reaches its peak so that you can get a good amount of profit. Imagine a newbie without any emotion control who is facing a market fluctuation. Without any knowledge of emotion control, he will panic sell for sure and make a loss.
It is OK to start without any knowledge and anything while doing DCA, but if you don't learn it later on, then that should be a huge problem. The internet is full of FOMO, FUD and all those influencers influencing people to take bad decisions. In a place like that, sticking to the plan without emotion control is really hard. You will fall victim for sure.