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 feel that emergency funds are not needed, especially if you are serious about investing. Most of them used to feel that if you were focused and consistent, you didn't need to worry about emergency funds. And emergency funds aren't only about hard work, they're also about planning for the unexpected. I believe this makes it clear to newbies that feel emergency funds are not required in the beginning, it becomes more important when time goes on, especially when accumulating and planning for long term.
Of course, if something urgent happens and there is no emergency fund, the person may be forced to touch or even sell part of their investment just to survive. And doing so can destroy everything that the person has worked so hard to achieve. That alone can discourage every investor. Having an emergency fund allows you to breathe easily and gives you the confidence to continue with what you're doing. It's like protection that allows your Bitcoin to grow without disturbance. Every investor needs to set up an emergency fund in the beginning, instead of hoping that everything will go well without a plan.