You both are correct in your point of argument, it's unwise and misinformation as I will also see whoever that think that only the DCA is the means of accumulating or buying Bitcoin , for instance taking a senerio like this a man is owning a debt and was advised to pay installmentally to easy the debt as he can't afford to pay all at once does not means that if the debt is paid once it will not be accepted the condition is only to help him or relief him meet up paying the debt since it can't afford paying once. DCA in relation to method of buying Bitcoin is not far from this example, as it's a means that offer all kinds of investor opportunity to invest within their reach, for me it easy stress if one can't afford to buy the lumps sum just as one with huge debt without different sources of financial support can't pay once so is DCA relief to many investor and newbies while accumulating Bitcoin. Though some who have all it takes to make use of lumps sum and dip as best choice could be there but I see DCA strategy as elastic medium of accumulating Bitcoin as the opportunity to accommodate all kind of investor is there.
Sometimes people do not understand that they have adopted DCA in the investments they make. But slowly they will realize that the comfort of the investment they have made so far is with the DCA strategy.
The advantage of DCA does not look at the price, when people are due to buy, they will do it.
There is also no pressure in DCA, for example you execute BTC with a budget of $20 and the next week it becomes $10, it is not a burden because we continue to follow up the accumulation for the next 10 years.
In addition, the convenience of DCA will not make you stressed with the price, because the determination of the average entry will be calculated when you are satisfied or have reached the last point such as reaching a milestone in 10 years of accumulation.
Apart from that, the advantage of DCA of course makes us consistent in buying because the routine we do runs once a week for a long time.