Bitcoin investing requires consistency and regular buy so when people centralize their thought on buying the dip only doesn’t sound okay. Buying bitcoin dip is okay but we don’t know when the dip will come and what will happen to our financial status during the period, holding fiat just because of bitcoin dip is only reducing one chance of benefiting since fiat don’t have much value compared to bitcoin. I love the dca strategy because it can be used during the dip at any time gradually accumulating bitcoin till when there’s enough to buy dip, As mentioned before bitcoin investment requires long term planning for better portfolio.
Your talks are not contradicting at some point, Bitcoin investment doesn't require consistency if you have the funds to buy it at once, you can have $100k somewhere sitting and just buy your thing and nobody will every know that you bough Bitcoin but for people who don't have the means to buy Bitcoin at once, this is where DCA comes into play and you can buy as much as you want later consistently until you achieved the required quantity of Bitcoin that you want to buy and even the person that has the means to bought once can still buy more if there is need to buy more of Bitcoin.
Buying Bitcoin with DCA is actually the best thing for people who don't have to the money in bulk to buy Bitcoin at once, this gives you the chance to see another price but then again, is not bad even you have money in bulk to buy at once. If you feel like the price is too high, you can buy with some part of the money and be buying gradually as the price changes, you will see that you will be able to buy much Bitcoin and more cheaper especially when the market dip much in the future.