emergency funds is very important that every bitcoin investor most have but it not that necessary that someone most have emergency funds before it can start it bitcoin investment
IMHO.
It's important that someone has an emergency fund before they invest in any investment or to Bitcoin.
Why? Because if someone spends his emergency fund into investment and they need it for what it is intended for.
You'll get the picture of what will happen next and that's about selling that. So, it will become no use if someone wants to invest for the longer and yet they have to sell it for some unforeseen event.
Emergency funds are needed to protect your Bitcoin holdings from any danger, whenever you use an emergency fund, you can immediately plan your investments according to the right plan and make your investments long-term. There are many Bitcoin holders who do not use emergency funds, they face the danger of taking their Bitcoins to their destination according to the plan.
And maybe after a while they have to sell their Bitcoin holdings and face different situations. Make investments that you can use for a long time according to the plan, that is why it is of course most important to have an emergency fund.