We can also consider that investing with an emergency fund may come in a quick demand in seizing for an opportunity to invest,
Emergency funds are to be strictly kept for emergencies. It is best to maintain this discipline and not tamper with it unless we are faced with real emergencies since we do not know when the emergencies shows up and wouldn't want to be taken unawares and risk tampering our portfolio in order to solve them.
just as we do have it form market shocks when it plummet after reacting on a particular cause and we feels its best appropriate that we fall back on our emergency fund in other to take advantage of the opportunity and invest, which i think its another way we can maximize our profit proficiency using another strategy (emergency fund) other than DCA we are used to.
Cases like this are why variances of reserve funds are kept aside for situations that are not necessarily emergencies. It is simple, if you want to buy the dip whenever it comes by, then save for it separately and utilize it when the opportunity comes by, I am not comfortable with leveraging on funds as important a emergency fund for non-emergencies because it can render your portfolio vulnerable, it can also undermine specificity and overtime, can even lead to wrong cashflow management practices.