You can still end up overinvesting and getting your self into the same kind of lack of an emergency fund, even with DCA.
DCA does not completely reduce the problem of overinvesting, but surely it can manage the overinvestment temptations that cause people (maybe moreso newbies, but it can happen to anyone who is overly investing and not sufficiently preparing emergency funds and projecting out cashflows for a sufficient amount of time in advance)..
I get the point now, even with the use of DCA strategy without the plan for emergency funds investment could go very bad were as you could be lack of funds when emergency needs will arise and as such you will be left with no option but to sell from your investment, perhaps I overemphasize DCA on one direction which is to solve the problem of overinvesting and risk management for accumulating a bit by bit forgetting the need for emergency funds which is very important and essential which will help and spice up DCA strategy knowing fully well that as your accumulating using DCA method your also adjusting to your emergency funds.
Or it can be said that a good strategy like DCA will be an unprofitable strategy if it is not done well or does not have a good plan. I understand that some people may feel so excited about investing that they start to overlook things that they shouldn't overlook. That may be a very good goal for the future, but it shouldn't burden us in the present, as we still have to live our lives and figure out how to keep our investments from getting distracted by other things due to a lack of measured planning.