Are you suggesting daily investing? I think you should change this statement. Investing in small amounts can be a good choice, hence daily investing? Have you forgotten about deposit fees? If you are planning to invest daily, then it may be possible to build another portfolio with your deposit fees. Weekly, fortnightly or monthly DCA may be a good choice for you, but buying more than 4-5 times a month will not be economical or profitable for you at all. .

It would be wrong for us to focus only on buying, rather we should also focus on fees and waste prevention. Suppose you are planning to invest $10 daily. Now if the fee is $1 per day, then you will have to pay an additional $30 per month in fees or even less $20 which is equal to your two-day investment. If you buy $25 4 times a month and your fee is $1, then you will have to pay an additional $4 per month in fees or a maximum of $5-$6 in fees. Which is not a very big amount.

So: The advice to invest daily is completely wrong. Along with investing, you can save on deposit fees. In this case, it is better not to buy more than 4 times a month. Weekly or monthly DCA can be a better plan. You should revise the advice to invest daily.