You are repeating the same thing over and over again. Buying on Lump sum is not a do or die thing. Everyone should cut their coat according to their size. If you have to lump sum then do it if you don't have then go with DCA. Smaller investors should use a strategy that suits their financial capability and leave huge investors to lump sum.
I believe that smaller investor you mean are those that don't have a larger amount to accumulate with the lump sum strategy I don't think there is anything such as smaller or huge investor people can accumulate bitcoin according to the level of their discretionary income but why the DCA strategy is mostly adopted is that it gives investor the opportunity to accumulate Bitcoin gradually increasing their bitcoin stack either weekly or monthly and also choose to lump sum if the money is there investor who don't have money to lump sum can also use the lump sum strategy if probably he won a lottery or got an extra income from place of work may also decide to lump sum and still be doing the DCA strategy also, so the lump sum strategy is not only for the rich investors.
Investing in bitcoin using the Lump sum method can actually be done by anyone as long as the person has money. Apart from that, the Lump sum purchasing method also does not know how big or small the amount of money we have. However, we can also use this lump sum method when we have small or not very large funds. For example, a person has 10 dollars that can be invested in bitcoin. For example, if you use the DCA strategy, in my opinion, with such a small nominal value, it is not appropriate to buy using DCA. Because if for example you use the DCA strategy and divide 10 dollars into 2 or 3 accumulations, in my opinion it will be very difficult. That's why the Lump sum strategy can be used if we are in that situation. So basically you just buy 10 dollars in Bitcoin. In my opinion, this is an example of a lump sum if we don't have much money. So basically this Lump sum method can be used by anyone and it doesn't matter whether the person is rich or not. Additionally, this example could go both ways if, for example, the person with the 10 dollars I mentioned above had additional income that could be invested each month. Because of course, if the person regularly collects money in Bitcoin (10 dollars per month) then this could be an example of DCA too. So the point is, whether it's Lump sum or DCA, as long as we have cold money that can be invested in Bitcoin, then just invest it, don't think too much about it.
Your point is valid Gallar - yet your example of $10 as a lump sum is a bit unrealistic because of the very dynamic you point out in regards to the impracticality of how it might be affected by fees.
I understand some people are really poor, including regular participants in this forum/thread, yet I think that we should be trying to construct our examples a bit more realistically - more widely applicable and perhaps even more aspirational for poor people to try to figure out ways to get up to levels of investing into bitcoin at $10 per week or something like that, even though they realistically have to modify their DCA amounts down in order to make sure that they are not spending beyond their discretionary income and that they are also building and maintaining both emergency funds and other ways of making sure that they have reserve funds (backup funds) within their own disciplined (and hopefully focused) practices.