There surely are trade-offs for any newbie who gives any shits about buying the dip rather than just figuring out ways to buy bitcoin persistently, consistently, ongoingly, regularly and perhaps even aggressively for 1-2 cycles or longer or maybe until they reach overaccumulation status.
Buying the dip adds a waiting component for something that might not happen, yet there still can be ways to buy the dip with a bit of reason and as a supplementary strategy rather than as a main strategy.
You are absolutely right. We know it is not always easy to catch the dip perfectly, but planning, setting orders and being patient will ultimately bring many results. Those who can do this with patience will get something good. However, no one can do perfect timing, so I think buying in small portions and placing orders at low prices are just strategic decisions.
The most important thing here is to have faith in your strategy. Those who move forward slowly with faith can gradually gain experience and profit over time.