Buying Bitcoin daily doesn't make someone a serious investor and it doesn't look or seem mature to me because a day will come when that person won't be able to maintain daily purchase because it will be tiring and inconveniencing if you ask, no matter how discipline and rich the person is. And I believe it is very rare to see this kind of investor that purchases Bitcoin daily but anyone that is comfortable with daily purchase should go ahead because the only advantage is that they have a high chance of getting to their target quick.
Dont talk down on someone's effort. If you are buying Bitcoin weekly as your normal DCA pattern, and it comes to a point where you have enough money to be buying on a daily basis. I wont see that as something not doing. Although there could be concern on transaction fees, but the easiest way to go around it is by keeping the money on a daily basis in his CEX and when it gets to the date he will buy weekly then he should buy all at once. After that send it to his wallet.
Buying on a daily basis is a good idea as long as it dont destroys the plan of buying weekly/monthly which is the primary way they set for themselves.