I also get the point that you are making transaction fee can be very expensive if you add them up together, but let’s also not forget that some people who choose to be making their purchase on a daily basis DCA daily some of them use centralized service to do that they buy on the exchange leave the coins their daily which they don’t need to spend fee until they accumulate up to a certain amount where they can then withdraw and pay only one time transaction fee.
Daily DCA plus using centralized exchanges to store bitcoin will save you transaction fees but you are risking your assets. There is no guarantee that those centralized exchanges won't get hacked or that your account won't get frozen before you withdraw bitcoins to a non-custodial wallet. We should not put ourselves in danger, so I also do not support the idea of daily DCA and using CEX to temporarily store bitcoins.
In short, monthly/weekly/daily DCA each has its own advantages and disadvantages, and depending on each person's circumstances, there will be a suitable choice. We should not impose our thoughts on others when we are not in each other's shoes.
I agree with you. Each person's situation will be different regarding their finances and ability to manage assets. I myself would prefer weekly DCA, I can buy on CEX and withdraw it directly to my wallet. or I will collect funds first and wait for regular purchases every month for a longer period.
What is actually worried about doing daily DCA? I am also sure that the price will not change much, especially in a situation where the price movement tends to be sideways. If the price is very volatile we can take advantage of the situation when it drops but if the market moves sideways for a long time, buying daily on CEX and leaving it there is still risky.