Since when is bitcoin a stock? And since when does bitcoin only increase?
Yes, if you are a good trader and can reliably predict the market you can beat DCA. But with DCA there is less risk of making a bad buy. With Bitcoin newbies bad buys often lead to bad sells, which is why I make the suggestion. I've made no claim it is optimal for all people, but if you have to ask (hence this thread), you probably want something simple without excessive risk.