This is the first step in the bank trading strategy. Banks never skip this step because it serves as the precursor to the other two steps.
Banks don’t just trade all their money at once when they want to make a trade that would lead to sharp spikes in the direction of their position. Remember that they have lots of money to trade. Everyone would just have to sit and wait for banks to make trades before they mimic the banks’ trades if that was the case. But this would lead to issues in the long run.