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It depends on how comfortable someone is when they want to become an investor and want to invest in Bitcoin, because if an emergency fund must be considered an important option for them, then preparing it early and separating it from the amount of capital that will be used in the investment, I think that is also not wrong because in the end it must also be prepared by every investor when they have run their investment. So don't think of it as something unnecessary if in the end it must also be prepared by the person making the investment and besides having to have that, every investor must also have a long-term mindset and should not panic easily when they see market conditions experiencing a price correction.
Emergency funds are the foundation for keeping your investments safe without being touched by various unexpected funding needs. It's like when you build a house, you need a strong foundation to support the entire building so that it is sturdy, without a foundation your house tends to collapse easily. That's how investing is, you must have an emergency fund as part of how you keep your investment assets untouched by unexpected funding needs.
Some inexperienced investors may only focus on investment goals instead of having emergency funds. They don't know what the consequences will be when they need funds as soon as possible, while all existing funds have already been invested. It could be that they have no choice and have to sell some or all of their assets, which will clearly damage the investment plans they have worked hard to build.
You are right that some investors do not have an idea about emergency funds and how it works but rather, they solely depend on their profit, which sometimes does not go down well with them and when their business begins to shake or have issues, they sell their assets just to solve the problem and in some cases when it overwhelms them, they get frustrated and that is the end of their business.
I once had no idea about this aspect of emergency savings till it dawned on me. That was when I realized that I had no savings. I made a budget for it and began my emergency savings, and it has helped a lot when I am in need of financial backup.