Both are very vital when comes to bitcoin investment (discretionary income and emergency funds ) . You need discretionary income to keep buying , because is like a left over which means that is money they you can put into anything (like your savings or investments) .
While emergency funds, certain amounts of money set aside to play the role of taken care of emergency expenses. And some time , some expenses come without any warning . So emergency funds always there to take care of such expenses.
Absolutely correct and I hope many investors would understand this and stop investing all they have on Bitcoin without left over that can be used to take care of emergency bills that might come unexpectedly. Being a crypto investor is not all about buying and holding Bitcoin for as long as possible but making sure that their are funds ability Incase we find ourselves in circumstances that needed fund to keep us safe and out of reproach that could make us a laughing stock.