It is not a good idea for an emergency funds to be used to buy bitcoin because this will definitely define the purpose for which it is meant for. An emergency funds should be in a form that it can easily be accessible whenever it needs arises in the future. Therefore, having It in bitcoin is wrong because when the need arise and it happens the price of bitcoin is low compared to the price it was purchased, then the person will be selling at lost.
I concord with the point you're making. The primary purpose of an emergency fund is liquidity and quick access during unexpected situations. Because of Bitcoin's price volatility, using emergency funds to buy Bitcoin can expose someone to unnecessary risk. If an emergency occurs during a market downturn, the person may be forced to sell at a loss, defeating the purpose of having an emergency reserve in the first place.
Emergency funds are better kept in low-risk and easily accessible options, while Bitcoin and other investments should ideally be purchased with money that is not needed for short-term emergencies. Separating emergency savings from investment funds helps maintain financial stability and prevents difficult decisions during urgent situations.