There is so much uncertainty in the market hence waiting for the dip is a wrong approach, with your dca strategy you are always there in the market irrespective of the price. Buying the dip gives investors the golden opportunity of buying more Bitcoin with the same amount of money, you can be buying with your dca when price is high and buy wholesomely or lump sum buy when there is dip ,the combination of the both wouldn't be a bad idea. Moreso profitability should be discussed in terms of quantity of Bitcoin you have and not the strategies been used because I don't think is necessary comparing both strategies in terms of the one that is more profitable and the one that is not, rather what you should be your most concern is accumulating more of Bitcoin and your ability to hodl for a longer period of time.
If they are waiting for the dip then maybe they are not ready to hold since what they always think is the price when they accumulate and for sure that they will be bothered when seeing more dumps to happen and that can affect their decision making in future.
It is not that they are not ready to hodli, any low coiner that is waiting for the dip is not ready to increase his bitcoin portfolio, and his bitcoin investment will be stagnant, which kills the idea of increasing your bitcoin investment portfolio. If a newbie that have not bought any bitcoin yet is waiting for a dip, I pity that person because he is not ready to invest yet, because the dip might not come when he is prepared for it, but it might come when he is unprepared, and he will miss out. This is why there is no need to wait for the dip, but rather continue buying and increasing your bitcoin portfolio with regular DCA, monthly or weekly. Delay is dangerous, and as you are waiting, you are not getting younger. Invest in bitcoin and hodli to secure your future, amd save your funds from depreciating as time goes on. Fiat and bitcoin is two opposite. As time passes by fiat depreciates in value while as time passes on bitcoin increases in value.
I agree with you that newbies who with just a little portfolio yet waiting for the dips to buy is probably not serious yet or probably undecided regarding starting building the Bitcoin portfolio. Instead of waiting for dips, they can starting accumulating bitcoin through the DCA method and when they have extra money they can buy when there is a dip in the market. This way they will be able to aggressively build their portfolio in a manner that the growth will be meaningful and decisive. Investment in Bitcoin does not require so much dragging of legs, the moment you get the information and is convinced it is worth investing on, the reasonable thing to do is to start immediately when available resources and then grow on the process.
As long as long as the newbie investor is able to figure out his finances and established a cashflow system such that some of the finances can be allocated to Bitcoin, then it is a reasonable thing to start at once without entertaining so much procrastination, which I know is affecting many people in their Bitcoin investment.