I believe that these two sides here are pointing at the same truth in two different directions. The thing is that good Bitcoin investment is reduced to risk management, and this is why discretionary income is frequently suggested to people, as it means that you will not be forced to sell all your assets to panic in case the costs of life will appear. Meanwhile, there are more highly-convinced investors or better-financially-shielded investors who make far more aggressive allocations, and history tells us this has been successful in the case of some of them. In my own case, I would consider DCA with discretionary funds as the most secure long-term course of action, whereas I would consider dips as an opportunity to be a little more aggressive provided that your financial capabilities permit it. In that manner you would develop progressively without putting aside money that you could require the next day.