Waiting for the dip to buy bitcoin means one is not yet ready to invest bitcoin because you might keep waiting not knowing you are just wasting opportunity. In bitcoin invest just try to grab the opportunity you meet everyday if you can, you don't need to wait to invest. Waiting for the dip to buy bitcoin is a big lose but people don't know this. Invest in DCA method now and earn a better profit in the future that is what matters. The market does not wait for anyone or give assurance to anybody to anyone to wait for a dip that will be favourable to buy in the future. Waiting for dip is a mistake that people are not even aware of but thinking they are taking good investment decisions on when to start.
It's funny because you can never even know the dip. A person waiting for the dip like you said is not ready because there's every chance he will buy it at a certain price but it keeps going down and he will start regretting why he didn't wait. You can buy at 50k thinking that's a good price only for it to drop to 30k.
That's why it's best to invest in DCA. One thing about this strategy is that you'll be surprised at what you accumulated at the year's end.
Another reason why waiting for the dip is not wise is that there's a chance you may not have money to buy when the price dips and you'll regret it.