IMO, posture and ground mechanics are the two most important factors to success. Without first establishing those, no jumper/sprinter/thrower/distance runner will ever be successful.
Now, if we take a heavy a clean and are always catching the weight in poor positioning at maximal load, what are we teaching the body? That at the point of greatest exertion, postural alignment can be comprimised. Then we go out and long jump, high jump, and triple jump and expect the same athlete, during a maximal effort, to hold form. Which is why, I am a proponent of moving bars fast in good positioning rather than to always hit efforts of 85%+ in quasi-good form.
Posture is round-the-clock and in everything an athlete does.
So to further my first statement about getting caught up in lifting tech, it is part of the greater scheme of postural alignment. If I were to semi-relate this to a CFKA quote, “nothing happens in isolation.”