I don't know, maybe it's because I've known both concepts for a long time, but what the OP says seems so logical to me that I find it almost banal. It's like if you want to fry something, you have to add the oil or butter first, not after. It's true that when you start investing, if you don't have an emergency fund built up and good budgeting experience, you may be tempted to dip into your emergency fund to invest more from the outset. But over time, you learn that slow and steady wins the race.
TBH, Don Pedro Dinero, I feel you on this, for people who already understand how to handle money, it does sound like plain common sense. But in reality, I have noticed a lot of new Bitcoin investors still mix the two up, and that is where problems start fr... Guys still jump in excited to buy the dip without having a proper safety net, and it all looks fine until life throws a curveball, maybe the car breaks down, medical bills show up, or some urgent expense pops up, and they end up selling at the worst time...
That is why I think keeping discretionary income and emergency funds separate is not just about discipline, it is about peace of mind. You can hold your stack without worrying about where money will come from when something unexpected happens. Even if Bitcoin takes a sharp drop, you are not running around looking for quick cash or regretting your moves... Like you said, slow and steady wins, i will add slow and steady only works if the steady part is not constantly under threat....