I totally agree with you waiting for the Dip is wrong for both newbie and old investors who wants to increase their portfolio and doing this won't only make an investor miss some good opportunity to invest rather it will make an investor to spend longer time in accumulating their Bitcoin. However, in my opinion instead of an investor to wait for Dip simply because they have some tangible Bitcoin in their wallet I will still suggest or if I am the one I will still be investing using the DCA but as much as my initial way of... While I still prepare for the Dip I think with this an investor won't miss so much opportunity, funny enough some investors who wait for the Dip sometimes when the Dip comes is either they won't have enough money to buy or they won't even invest at all because the Dip comes unexpected.
I disagree with you mate, although not entirely, A newbie has no business waiting for the dip since he/she has no existing Bitcoin investment, so should start immediately to accumulate Bitcoin.
There's levels to this old investor ratings. There's an old investor who is closer to his accumulation target, as well as one who's still far from his target. For example
Let's take a scenario of two investor who has same plan of holding for 15 years and an accumulation target of 10btc.
Investor A has been into Bitcoin for 5 years and accumulated 3.5 BTC out of the 10, you can say he's still far from his target and as well should continue buying regularly and not necessarily only wait for the dip.
While
Investor B already has 8btc in 8 years and still has 7 more years to go, you can see that this investor was more aggressive in his early days and is already much near his accumulation target. Such investor can choose to save up his normal purchasing amounts and wait for the dip to reach his accumulation target.