In fact, even if you don't invest in Bitcoin, it's important to create an emergency fund. Emergency funds are created for urgent needs, you may get sick at any moment and you will need money if you are sick, so if you have emergency funds it will not affect your investment. Maybe some investors reserve emergency funds to maintain regular investments, but it seems most investors reserve emergency funds for urgent needs. I personally reserve emergency funds for urgent needs, I do not reserve emergency funds to maintain continuity in investment. I will never buy bitcoins using emergency funds, because investing consistently in bitcoins is not mandatory.
Yea, you are right to an extent that investment in Bitcoin consistently is not mandatory, but for you to attain success in your accumulation, you need to be consistent in your accumulation.
Additionally, emergency funds is that funds that stands as the last layer of protection of your Bitcoin investment, so if you don't have it in place, their is a higher probability that you will be unable to hold onto your Bitcoin investment on the longer run, so if you are saying that you don't reserve emergency funds to maintain continuity in your Bitcoin investment, you are terribly wrong with that statement, because the primary security to your Bitcoin investment is your emergency funds, and it is that funds that bails you out from real life emergencies that may have warranted you to temper or sell off all your holdings once emergencies strike.
But generally, as an individual, it's unwise not to have an emergency funds because emergencies might strike ( like sickness) and you might not even have the money then to sort it out which is not the best possible situation to be in.