I think it not compulsory that emergency fund must be 3 to 6 months ahead of our salary.
I think @merit.s is referring to those guys that does not have a good cash flow. Because most guys may not be earning a decent amount in thier job, so without them putting 3 to 6 months of thier salary into thier emergency fund, they won't be safe from thier Bitcoin investment. I think that's where he was actually trying to point at.
Agreed through and through.
It depends on many factors and what live we live - what is needed and what we can ignore for the time being in order to be both in comfort with ourselves and our investment at the same time.