Emergency fund is not mandatory for investment, if the investor does not give it much importance, there is no problem, but I think the investor should give importance to his continuous investment. The more serious an investor is about his investment and the more consistent he is, the stronger his investment will be. Basically, emergency fund is a very secondary issue for an investor. Those who have sufficient financial solvency and are very serious about their investment usually form emergency fund. The advantage of emergency fund is that if the investor fails to invest consistently, then that investor can use his emergency fund and when his financial condition returns to normal, he can replenish his fund with money. However, emergency fund is not mandatory for everyone.
You seems to be missing the whole concept here, maybe when you start your own accumulating journey you can choose not to set up your emergency fund Instead of including others, since you think is not mandatory, i can only agree with you if you said that emergency fund is optional when getting started. But once you reach two weeks of accumulation then you have to start looking for a way to set up an emergency fund, your emergency fund is what will guide you until you reach your investment goal in case you have forgotten, because if you don't set up emergency fund along the line there's every possibility that you will temper your bitcoin investment some day. And this will happen unexpectedly, so I will advice you don't mislead yourself here.
Some people are confused about emergency funds because they don’t have enough floating funds or discretionary income. We may have differences of opinion on what kind of strategy they should follow when it comes to Bitcoin but ultimately we can conclude that you should limit your emergency fund requirement to start Bitcoin (if you don't have any don't pressure yourself). What I mean is that if someone has a very small discretionary income, they should start accumulation Bitcoin. By studying Bitcoin and practicing they will start to become more aware of investments and will be tempted to do it for the long term and will be motivated to increase their alternative income. Starting Bitcoin can motivate them in the long term.
Those investors will also know that they will have to protect their Bitcoin holdings, so they will build an emergency fund to find ways to do so, which is a matter of aligning them. Those long-term investors will eventually realize that the need for an emergency fund is very important to continue long-term Bitcoin accumulation. In most cases it should be mandatory regardless of your financial capacity. At the same time you should focus on all aspects of financial stability, income status, and each of them for long term holding.