What you said has totally defeated the idea of one being disciplined or having a plan in the first place.... The whole idea of separating discretionary income from your emergency funds and evn reserve funds is so that each one has its own purpose. If we start mixing them up, it simply shows disorganization, weak planning and poor cashflow management.....If a newbie happens to enters into Bitcoin investments with what you said, honestly speaking that newbie wouldn't even last a year in his/her Bitcoin journey coz he may end up using his discretionary income for emergency situation or even channelling it to his reserve holding.
Of course emergency can happen, but then that's why building a proper emergency fund outside ur Bitcoin is very very important. It creates a buffer, so you wouldn't need to touch your Bitcoin when life takes an unexpected turn.
If you always rely on emergency fund then it will never be the right decision. Because emergency fund is the last resource to protect your holdings. If your emergency fund is the first and last resource then it will never be the right decision. It is never right to take money from emergency fund for small financial crisis.
You can divide your funds into 3 levels. Such as cash, reserve fund, emergency fund. If you build your funds in this way then it will be much better for you. For example you can take money from cash to deal with small financial crisis, you can take money from reserve fund to deal with big financial crisis and finally if you do not have any money then you can take money from your emergency fund.
You cannot build 3 things at the same time. So first you have to build an emergency fund and after that you have to build it gradually. But if you delay investing to create this fund, it will never be the right decision. You will have to create the funds along with the investment.