but the Bitcoin DCA method is most useful on a weekly basis,
You are wrong here the DCA strategy is not just useful for people who are accumulating weekly it is also useful for those accumulating monthly, there are people who receive there salary monthly and they can also use the DCA strategy and it will be so useful to them, in DCA strategy when ever you receive your salary is when you can accumulate be it weekly or monthly using your Discretionary income.
You both are right. Surely Bitcoin investment could be done weekly or monthly no problem. But the most important thing is having a discretion fund to invest in the intervals you plan to regularly invest without missing out or slacking. @BitBakerr1 in your last paragraph you seems to be describing investing monthly DCA to be salary investment in my own understand but don't forget that you must invest from your discretion. If a person is working and his investing monthly does mean your salary becomes your discretion. You must develop the attitude of having a discretion to enable you invest at you appointed time. Because surely there are times when salary don't come as it ought to come and that will delay your investment if you don't have discretion. Don't think about salary but rather think of discretion.
Or do you think those who are accumulating weekly accumulate more than those who are accumulating monthly if that's your thought then you are wrong what determine more accumulation is the amount and not day's you may be accumulate weekly using $50 then 4 weeks in a month gives you $200 and I can be accumulating monthly using $300 I'm still accumulating more than you do.
Actually accumulating weekly does not mean that such investor is accumulating more than the monthly DCA investor, even though surely weekly DCA is very important compared to monthly DCA, but what matters is the amount invested consistently over a long period of time, thereby increasing the Bitcoin portfolio. And being able to HODL without selling too quickly.