We as humans always will, and always have needed to graduated from the most basic of systems, before we even attempting to learn more complex systems.
As a child, we learn to walk before we learn to run.
In education, we graduate from primary school to secondary and so on.
In an athletic (specifically plyometric progression) sense, we need to learn to land before we learn to jump, learn to jump before we learn to jump continuously, and learn to continuously jump before we do any sort of shock training.
This system needs to be followed in every direction as well, not just vertically. We need to be able to absorb and produce force vertically, horizontally, laterally, and in a rotational fashion if we are attempting to create any level of athleticism. Once we can absorb and produce force in every direction, we can then graduate to learning how to apply that force rapidly and elastically.