An emergency fund should be considered essential by anyone considering long-term Bitcoin investment and not wanting to disrupt their Bitcoin balance every time they need cash. However, I recommend everyone have a steady job with a regular income stream so they can manage it carefully, including allocating a portion of their income to an emergency fund and using the rest as capital to buy Bitcoin.
Yes it's true that emergency funds is very much essential for the survival of your Bitcoin investment, but looking at the highlighted words in your statement, it's actually a terrible advice if you are giving it to a newbie, investment in bitcoin should be done consistently from your discretionary income only, not from your source of income or money meant for your upkee, because if you have not first taken care of your basic needs, your investment will hardly survive even without emergency situation.
So sorting out your discretionary income is the first major step needed for a successful investment in bitcoin, because if you are only thinking about investing in bitcoin and you haven't sort out your basic needs, sorry for saying this, you are just getting busy for nothing because you will definitely fall back to your Bitcoin in other to sort out your basic needs.