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Automated DCA! This is something that has crossed my mind for some reasons but believe me it will definitely not still be near perfect as that of a manual DCA done. First off I think there will be discrepancies on the time that the orders will be triggered or rather will have all those using the automated method orders triggers at same time. Like a daily set up will trigger just immediately after the day goes off. Each investor will have his preference as to when they wish to have set trigger, for example some incoming fundamentals will require one to go in early or join the late trade but automatic set will definitely just trigger when the exchange time comes without taking advantage of this fundamentals.
The manual method still remains the best, just that you will need to be available when you wish to take the trade but yet a limit order can still be placed for certain market price and it will trigger this only just depends on price and not time again like how the automated will be. The awareness or ability to place the order yourself to me is even a key to how you manage your finances or how you pay attention to them.
I haven’t tried this but with your information of binance offering it triggers me to have a glimpse of it, I will have to give it a try and compare with my manual purchase
Your points are mostly valid Zaguru12, yet I am pretty sure that most exchanges that offer automated DCA are attempting to not move the prices on the order books with the daily automated DCAs that are getting executed on their exchange, yet we cannot really know with any level of confidence since the information is not transparent and maybe we would not want the information to be transparent even though we would want the exchange to be honest in the way that they are executing the daily automated buy orders.
Regarding your point of manually setting limited buy orders, that is how I used to do it when I was first in my earliest BTC accumulation stages.
I would have an authorized amount of BTC to buy every week. .. .let's say $100, and so then I would set some limited buy orders at various prices below the current price, and then if by the end of the week all of the buy orders had not executed, then I would manually buy whatever remained on the various buy orders and then set another $100 for the next week... so there was attempts to buy the dip within the week, but if the price did not dip, I would just buy at whatever price came at the end of the week.. and I even sometimes changed which day (or what time of the week I would do my resolution of each week.
Sometimes my resolution/finalization of my weekly DCA allowance might have been on Saturdays and other times on Tuesdays and sometimes it was during the day and other times it was in the night depending on what I had established (or authorized) for myself for the week, and surely some folks might claim that there might not have had been any advantage to my system of buying and a more strict DCA approach would have had been better and less work, which surely it is difficult to prove either way, since I speculate that I was getting what I wanted out of the deal, I was engaging with bitcoin every week and I was mostly buying bitcoin every week within my own authorization levels too
(that I was free to change at any time that I wanted), even though my buy orders sometimes executed during dips within the week, or I ended up just buying BTC at whatever the price was at the time that I had established to resolve/finalize my week buys (authorized DCA amounts).