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.
Salahmu, as JJG has said, DCA would only help to manage the overinvesting temptation. Yeah, emphasizing DCA, it's either you already have a huge amount of money that is already set aside for bitcoin investing (example, $100k), but you don't just want to invest it at once because you feel the price will go down below what it is, and you start to invest using the DCA strategy. Secondly, if you are working for a monthly or weekly salary, you can also have an amount you always want to allocate to bitcoin, either weekly or monthly, at any time you get paid.
But I think overinvesting in bitcoin is also a simple problem you can avoid if you always have it repeating or if you want to prevent it from happening. The way I think it can be avoided is by having your budget planned so well, either before you receive your salary or after you have received your salary.
When you are close to receiving your salary or after you have received it, you just have to take your time and make a budget, and while doing so, never forget to also add some funds to emergency funds, then allocate the amount you want into bitcoin.