Yeah, but you are fighting with the hypothetical, because in this hypothetical the BTC price is already $80k and a newbie is coming to BTC and he is having to decide what to do at that time. He cannot go back in history.
Another thing, is your presumption that BTC will dip merely because it gets to $80k. That has not always been the case in BTC history, but still we cannot necessarily merely use BTC price history in order to make our decision about what to do. We have to decide right at that time what to do, and we are new to bitcoin, we do not have any and we have to decide.
If you decide to wait for the dip, then you still don't have any BTC if the price does not end up dipping as you are suggesting that you expect it to do so.
I believe that eventually investment in Bitcoin will potentially yield significant returns, no matter at what price you buy it. However, the decision to invest in Bitcoin when prices are higher or wait for the potential dip is a personnel one. It completely depends on individual's financial situation, risk tolerance level and ability to continue holding it until the bull season demands patonce. This aspect might play a crucial role in success of investment.