DCA method doesn't give investors the mindset of being consistent rather investors disciplined themselves and know what is right to do because there are a lot of investors who uses the DCA method yet they are not consistent with it so that method doesn't give investors the mindset to be consistent. Just like I said earlier any strategy can be good and perfect depending on your capacity, you are sounding like a trader at the end of your post however, you can't incur loss because of change of strategy rather you can become stranded and biased if you don't know how to manage your investment and your income.
Situations affect people who are willing to make amends positively, and having responsibilities makes you more matured and sit up in your indifferent attitude. I would be very fast to disagree with you because I have been very much financially aware since I started DCA bitcoin accumulation process, just knowing that I have the responsibility of setting aside some portion of my earnings to accumulate bitcoin weekly has made me very good at planning my finances, good thing it spread to other walks in my life and I was able to manage my finances better.
I know there are some people who are careless with their life activities even when presented with opportunities to thrive, but if you are a student of determination, dedication, financial maturity and commitment, then DCA accumulation when followed strictly without fail is a very good teacher of those qualities.