We see it every time Bitcoin goes to a new lower level.
Bitcoin "believers" will hurry to say "buy the dip" and "just wait it will come back"
Reality is that every dip is a new lower level - and after that comes another dip...and another.
In the beginning of 2017 very few people had Bitcoin - and therefore the price could quickly move up as a large number of people with zero financial understanding started buying Bitcoin.
Now a large number of people with zero understanding has Bitcoin and price moves down - there are no more new fools to get into Bitcoin to ever pump it again.
"Buy the dip" is something only fools believe - and as can be seen in here there are unfortunately many fools in here who do not understand that their money is already lost
I don't see anything wrong on the strategy of buying bitcoins or investing when the price goes dip because bitcoin is very volatile and its nature is to pump and fall.The price would never goes just like the price today when it is stable that anyone did benefit as its price is below $1 or lower than that.