I really agree with you that there is no fixed amount or price when it comes to DCA, it all depends on personal interest or choices in which you can eventually be able to afford without having a break down in your daily income or monthly salary,
Even if you can use any amount to invest at any time of your DCA but it should be within your discretionary income and also, making an investment plan for your income is very important such that you can focus more on your most important needs in order for you to have enough discretionary amount to invest. On a normal context of the DCA, it is supposed to be about investing same amount of bitcoins but the reason why we don't need to be so strick about the fixed amount is for a stress free investment without having to be struggling to meet up with the fixed amount at every time of your DCAing.
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A very funny debate, how is it possible that when someone does DCA on bitcoin there must be a rule about the nominal, I think it is illogical. Because the name of the investment with the DCA method, of course it is up to each individual and no one should regulate how much money will be invested in each accumulation. Because basically everyone's discretionary income will definitely be different, so of course the money that can be accumulated into bitcoin will definitely be different. In addition, in investing, in my opinion, when talking about the nominal money or capital, we don't need to be fixated on other people's assumptions. Because basically our circumstances with other people are definitely different. So what must definitely be learned from other people is things outside of investment capital, then it is good to learn from other people. So the point is when you are going to invest in bitcoin, look at your own situation first and don't look at other people's circumstances (in terms of finance). Because if we look at other people's financial situation, of course the results will be less than good for our mindset in viewing investment in Bitcoin.