In as much as investing 100% could be risk or over investing but with this method you have explained I think it will be very difficult to get into trouble during the accumulation process because you have already eliminated any possible risk that could arise along the line, actually this method has been very helpful for so many investors today and funny enough I have make use of this method sometimes, especially when I'm very close to receiving my monthly salary and by then I have cleared all possible needs that would arise so I will then putting 100% percent of my available funds at that moment while waiting for the salary to come so that I could balance the equation and from their continues my DCA.
Actually I only use that method whenever I feel I'm free from any needs and my monthly salary is very close, however it takes a proper understanding for an investor not to make a mistake on this method because like you have explained that investing 100% is only good before the pay period so that they will not ran into trouble but funny enough most investors will still be aggressive trying to be greedy.
1. You are not expecting any needs, but life throw curveballs, things could go wrong like health and emergency need which you will need money for that is why it is important to keep reserve funds.
2. There could be a time where you might see a delay in receiving your income, thereby you need more money to survive and invest.
This your idea might seem logic to you, it's still a risky move to make. At least try to diversify instead of putting your entire money in one basket even if there is a huge assurance in that assets and even with a paycheck coming soon. Money that is not in your hand cannot be called you money unless you receive it.
The earlier you understand that in cryptocurrency, their is no diversification the better, because their is no substitute to Bitcoin in the crypto industry, all other coins are just means in which these developers used in milking investors of their hard earned money, so I would advice that you take your diversification else where, somewhere away from cryptocurrency entirely.
And lastly, concerning what you said about other source of income, though I sees it as an of topic here, in this thread, but if I must respond to that, then it's very wrong to survive on a single income, because the rate at which inflation is ravaging the fiat and making it lose value is really a cause for alarm, so it's adviceable to have more than one source to keep you afloat, in your daily lives.
And yes, I subscribe totally to the fact that it's not right to invest 100% of your earnings into Bitcoin and to be really honest, it seems very vague and untrue if someone claims that he is able to invest at such rate and that he will be able to do that consistently for at least four years while getting his life in shape. Let's try to be realistic enough to the fact that Bitcoin investments is just an aspect of our lives and definitely don't play the biggest role in our lives. As we continue to DCA, we can't do it leaving other aspect of our lives on pause till we've reached our accumilation goal and that's the whole essence of DCAing since you can just take the range of 10% to 30% out of your income and use the remaining 70% or so to still sort out yourself. This is not just a medium to air out things that aren't real and practicable and so, as much as we try to point out some possible scenario that we've not reached the level of doing, let's try to tailor down our opinion to the fact that we've got to still invest responsibly with an amount that's within our financial strength and that will allow us take care of our emergency and daily needs.