Don't say Bitcoin and crypto together or Bitcoin and altcoins together. Your post is like knowing Bitcoin is also knowing altcoins or knowing altcoins means understanding Bitcoin.
DCA is a good investment strategy especially with Bitcoin investment and accumulation while it can work bad if you apply it with altcoins or shitcoins.
With Bitcoin, if you DCA and hold bitcoins a long time, you get good profit but with altcoins, if you hold them a long time, you get big loss. If you DCA altcoins a long time, you lose bigger capital.
Is that true? I think this will depend on which altcoin you are investing in as not all altcoins will never grow or will die. For example, if you have been investing in ETH and DCA since the 2022 bear season until now, and if I remember correctly, the lowest bottom of ETH was below $1k. You may not make more profit than bitcoin investors but at current prices you have made a significant profit. Or those who have invested in solana or many altcoins since the bottom of the 2022 bear season are also making very good profits.
Indeed, it is not correct to equate the potential of bitcoin and altcoins because they are not the same, but it is also not correct to say investing in altcoins will always be a loss. We should accept the fact that bitcoin is not the only coin that can bring profit.
I don't think it has been true for every alt, but it definitely has been true for a lot of them. As far as the future, who knows. There may be a few alts that have a viable purpose but a lot of them only have the purpose of scamming someone to enrich themselves.