The uniqueness of Bitcoin is the fact that price does not continue in one direction forever, it goes up and retraces sometimes in what is called correction. The term "buy the dip" comes from this corrections where it is expected that one can buy at lower prices. Those who are actually practicing buying the dip now have a golden opportunity before them to buy at prices lower than $44k which is about the short term high before the retracement.
The only weakness of buying the dip is because it will be difficult knowing the end of the dip. One can buy when price moved from $44k to $41k thinking you have bought the dip without knowing that price was headed for $38k and lower prices. This will however be a problem only to those who are buying so that they will sell immediately price start rising. For those holding for long term, such scenario will not be a problem because they are not eager to sell.

Interestingly,  those of us using the DCA method do not really pay much attention to the price because wether price dips or not, we already budgeted the amount to buy per week. This time that price dips only make us have more BTC for the same dollar amount we would have spent assuming price were at $44k.