Buying aggressively must be with careful calculation, I agree that it is never too late to enter Bitcoin, especially to invest in the future, but I do not recommend buying aggressively without calculation.
It would be better if we apply a strategy and do it consistently, the DCA strategy may be the best option if we want to invest in Bitcoin in the long term because if we look at the history in the past, I think all of us here have no doubt that the same thing will happen again in the future.
If we are confident with bitcoin, in my personal opinion, whether to buy aggressively or with a gradual strategy like DCA, I don't think it's a problem, as long as the funds invested are discretionary income, I think that's the important point. Because aggressive purchases or with DCA, it's just a method or strategy that can be adjusted to our financial condition. So if our financial condition supports aggressive bitcoin purchases, I think that's good too and vice versa if our financial condition supports DCA, that's also a good thing.
So the point is if we intend to invest long-term in bitcoin, as long as we use discretionary income, I don't think it matters what purchase strategy will be used. Because basically it ultimately leads to the same goal, which is long-term hodl. So the point is we have to be more flexible regarding the purchase strategy that we will use when investing in bitcoin. And don't assume that other purchase strategies are not good enough. Because the point is if everything is done with discretionary income, the chances are it will definitely be fine.
You're correct about using discretionary income to invest in bitcoin and it's importance when you aim at long-term holding. But I don't agree with you when you said that the investment strategy doesn't matter just because you are investing with discretionary income. Investment strategy is not just about investing in bitcoin at the early days of your investment. Your choice of investment strategy allows you get your accumulation target by nearly allowing you figure out the possible date you can attain your accumulation target. Using the DCA strategy as an example, so long as you have a basic source of income from where you derived your discretionary income, it is possible to figure out your probable date of reaching your accumulation target. This is because, you choose your DCA approach carefully, date and amount.
This also disciplines you against giving excuses instead of investing the money and lets you remain consistent in your investment process. Ignoring your investment strategy can make you loose focus and sometimes spend your discretionary income on irrelevant things before you realise that you could have used it to add to your bitcoin stash.