DCA everyday such that he can have the opportunity to buy at DIP prices since the market also experiences short time market fluctuations some days, instead of DCAing weekly or monthly which he can miss DIP prices since before the time of their next DCA, the price must have increased and he keeps buying more at high prices.
It's better to do DCA each week or month or buy during the dips and that may be much better than DCAying everyday. Instead of DCAying everyday that person could also buy Dips each day and that's a better approach but still that's not going to be helpful in long term.
I've never heard of anybody that DCA everyday, it can be exhausting in the sense that the person won't have the time to analyze whether to accumulate more during dip. Weekly or monthly DCA method is better, the investor will have some time to study the market and see opportunities whether to stash more when there is dip. Instead of DCA everyday investors that have excess funds can buy dip everyday until there's a correction. Buying everyday even when price is skyrocketing doesn't make financial sense to me, when price is rallying there is need to take a little break, study the market and decide whether to take a break or continue.