Your comment is very misleading. Having discretionary income is not something that will force a person to buy aggressively, it is entirely up to the individual how they buy. An investor should always buy using the DCA method and continue to buy consistently until their portfolio is accumulating enough Bitcoin. You can create a separate fund for buying aggressively. If you see a decline then use that fund to buy aggressively
There is nothing misleading as long as the final advice is to buy Bitcoin because even though it always depends on each person's personal desire in terms of buying, I think everyone will definitely use what they are most comfortable with when they want to do something they want including buying Bitcoin. So when there are people who move with different methods in buying Bitcoin, it is not a mistake because the ultimate goal is to buy as much Bitcoin as possible with the amount of capital they have.
So the difference is just a natural attitude that needs to be seen and learned by people who have not used any method at this time. Because in terms of buying certain assets or Bitcoin, of course everyone must have capital in the form of money even though it is only in a small amount. So there is no need to consider other people's comments as something that is wrong even though it may not be right for yourself.