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.
Keeping emergency funds will make you grow in an investment because even in normal Fiats savings, you can't save all your money in the bank and you are left with nothing, it will make you to keep tampering with that amount you kept as savings since you don't have any back up funds to attend to emergency situations. It is true that a lot of investors don't keep emergency funds because they have no idea of it, but any determined investor will always make provision for funds that will assist them while they are investing, and they will also know the set back that comes along when you are investing and taking part of your holdings to sort your sudden needs. Emergency funds should be kept in Fiats so that it can easily be accessible whenever you need it for use while your hodlings in bitcoins are very much intact without being tampered, instead you invest more while hoping to get a big investment.