Buying bitcoin aggressively is still reasonable if it is done according to our own discretionary income, but what is not recommended is to wait for the price to drop to buy because yes we don't know for sure when the price will drop or even not happen at all, so it's better to buy it when we already have disposable income don't hesitate about the amount that is not much because with this DCA strategy it can be done as long as we are consistent.
This aggressive purchase can be done by accumulating all the discretionary income we earn, if we have previously invested and still survive and then take advantage of the price drop to increase the purchase, it is not bad either.
It makes sense if someone doing this has a lot of discretionary income so whatever method they use for aggressive purchases isn't a problem because they are assured that they will be able to meet their needs.
However, this is different for those whose financial resources are very limited making them unable to pursue the same approach as those with multiple sources of income. This means they are aggressively pursuing their investment solely with their source of income while I believe they have multiple sources of income for other needs. Therefore their approach wouldn't be feasible for those whose finances are only sufficient for their essential needs. This is clear, as you stated. If all of this discretionary income is accumulated even a small amount will appear substantial meaning it's feasible to do so. This is especially true when purchasing BTC using the DCA strategy which doesn't require a large amount meaning even a small amount can be used by those who intend to accumulate BTC.
When we have an income, we naturally have needs that must be met, including monthly or daily expenses and paying bills. When we have an income, our primary focus is on meeting our own needs, and only after that can we allocate our discretionary funds to an emergency fund, a savings fund, or investments that interest us.
Youre right with the DCA strategy, we can start with a small amount rather than a large one. This certainly makes it easier for anyone who wants to invest, since they dont have to rely on accumulating a large sum. The focus should be on making regular purchases rather than the amount invested; its better to see gradual growth over time.