Some people do not have any choice regarding lump sum. If they have $2,400 coming in per month, and they have between $50 and $100 per week that they are able to spend on Bitcoin, then maybe they are choosing to buy BTC every week, but surely if they save some extra on the side for buying on dips, maybe they don't have a lot that is set aside, so they still might not have much choice but to invest whatever extra cash flow that they are able to generate by increasing their income and/or by reducing their expenses, and maybe once in a while they might be able to get some extra cash coming in that they would have the ability to decide the extent to which lump sum and buying on dips might be preferable to just continuing with their ongoing practice of DCA.
I understand that some people don't have a choice when it come to investing a large amount of money at once. If someone has fix income and not have much extra money... they may not be able to save a lot for buy investments when the prices are low. In these cases they may have to keep investing a little bit of money regularly. But it is important to think about ways to make more money or spend less so they can save more for investing. It's about finding the right balance between regular investing and taking advantage of good opportunities in the market. And this is only Bitcoin where they can believe in.