Yeah you are right some people feels DCA strategy are for people who really don't have a large source of income but that's not true those with a large source of income and those with small source of income can use the DCA strategy, if you have a large source of income that means you may decide to use a high amount of money to accumulate Bitcoin weekly or monthly but those with small source of income may decide to use use a small amount of money to accumulate weekly or monthly when it comes to DCA strategy it all depends on your financial strength, the reason for DCA strategy is to remove pressure from you, it is only when you receive your weekly, monthly or yearly income you will invest however you can still choose to do more if your financial strength can carry it.
Buddy you have been able to clarify may things I'm regard to the quote in question which I will also want to add somethings to the one you have said already, DCA method is for everyone both those who are very financially buoyant and those with low earnings but better for those with low cash infow but if everyone want to efficiently acumulate Bitcoin without stress I think both class of individuals will be needing DCA method to enable them accumulate easily without stress consistently.
I think the main reason for DCA method is even procrastination, even some people that has money sometimes procrastinate a lot, they will be finding it difficult to invest with large amount because of either fear, lack of trust, lack of understanding and unawareness but with this DCA method they can start with the amount they are okay with continuously then when they are convinced, they can increaed to a higher amount instead just being idle spectating.
Another thing is those that has the money and want to invest during the dip because of lack of understanding, the DCA method was also created for this people so that they won't wait further to avoid being discourage along the line hence the dip time can't be ascertained to know how long it will last, also for low income earners that thinks the investment is not for them, they can start DCAing with the little they can since the investment will be for a long-term, in conclusion this strategy serves everyone according to your plan due to your picket and it doesn't mean that that you will continue DCAing with the amount you started with, you can increase once your pucket gets more bulky that's why it's very efficient though it depends on what we want individually.