DCA is going to be quite problematic for any coin or project that is generaly trending downard in its price... One thing about any asset with strong fundamentals would be that even if it is trending downward for very long periods of time, if the fundamentals are strong enough, then the downward trend should end up reversing, and sure it is not guaranteed to reverse, and sometimes we might not know that something is a shitcoin until it never ends up recovering.
Surely there are some shitcoins that end up having second lives, and so there could end up being some value in DCAing into them and then getting out during one of their recovery periods... but yeah, would we call that investing? Probably we would call it trading and/or gambling... depending on how wild the coin is and if there might be some reasons that the coin/project actually has meaningful/substantial value beyond pumping and dumping.
But JJG the difference is that we do some analysis here and know that sometimes you trade fundamentals or you can trade the sentiment or information you have. Too many people are still stuck with terms like market capitalization or coin price. They have no idea, don't read basic material about bitcoin, fall for the most fancy techn language and check coinmarketcap for low market cap coins in hopes to see those rice to bitcoin levels. That is where it becomes stupid. You know these sentences "but bitcoin very expensive, trashcoin only $0.05, much potential". Some don't even understand the concept as mentioned above. When there is a coin that costs 1/1000th of bitcoin, but there are 1000x the number of bitcoins, they still think that it takes less money to push the price of that trashcoin that to push bitcoin upwards.
And one thing that I experienced when I tried holding one trash coin that I tried to catch up some its gains months back was that I wasn't having this peace of mind, Because right inside me, I know there's no guaranteed future, even though that the coin looked promising and later performed well but I wasn't still having that peace of mind I have holding my portfolios in Bitcoin, and obviously I can tell from this experience that holding those trash (shitcoins) is just gambling your funds.
This is your choice, my friend, if Bitcoin is the only one that gives you peace of mind and you fully know within yourself that a coin is truly a "Shit"coin, why then still invest your money in it if you are sincere with yourself? Like me, I make sure that I go for the best choice that will give me the rest of my mind, so I will never term them shitcoins because I have never regretted investing in them, they are just altcoins which is best described by the alternative to Bitcoin, so they are not automatically worthless like many would want people to believe in favour of Bitcoin. But when it is becoming a shitcoin, I wonder why on earth anyone would want to invest their money in such a coin that will "shit" them indeed...lol Or perhaps you are trying to make it look like that, and if you do not mind, I like to know this coin you called a shitcoin.
However, if it is not worth it really, why not just avoid it next time and go for only coins that will give you the rest of mind and add positively to your crypto portfolio? I diversify my portfolio just for you to know that I am not investing in Bitcoin alone, and especially at the high price of Bitcoin, it is a disadvantage for me no matter what anybody says to me. As an investor of over a decade before Bitcoin, I will not be sentimental as though it is the only one that will give me the rest of mind in the crypto industry, no, I can only say that it is the most reliable in the industry. It is worth knowing that I have my sizeable amount of Bitcoin as well and I will continue to play smart between Bitcoin and altcoins depending on my feelings and speculations, and not what the internet or anyone wants me to believe.