Yes it's important to have a large 'exercise toolbox', but what I think sometimes gets forgotten is that each exercise has secondary adaptations and/or consequences. While one choice of exercise might seem like a smart selection to target a specific motion around a specific joint or joints there are additional forces being applied to areas outside of the key areas.
Take ab rollouts of any kind; done on stability balls, TRX or Blast Straps, or the ab wheels. These may be great exercises for anterior "core" stability, but what's going on, as far as forces, at the thoracic spine and shoulder complex? I am specifically thinking anterior tilting of the scapula and thoracic flexion. Sure the athlete might be coached to maintain the correct positioning, but the forces are still being applied.
... Or take an athlete who is completely "bound-up" in the rectus femoris. So much so that going into any kind of lunge position pulls the pelvis so far forward (anterior tilt) that things start to spill out. Is a forward or reverse lunge a good exercise for this athlete to perform. Can, or is, the athlete disciplined/skilled enough to be sure as to not use the posterior leg for eccentric stability or any driving force to come out of the lunge? Especially when any type of heavier load is to be used. Speaking from experience, I have had extreme soreness in the rectus femoris from performing reverse lunging the day prior... what's the adaptation?
I am not saying a certain exercise should not be done, but the "big picture" needs to be seen when applying any exercise with the hopes of improving performance. There are multiple adaptations that come from every exercise based on the movement itself, type of external load, where the load is placed, volume, intensity, or even the subject performing the movement... plus many others.
Is corrective exercise necessary or is it just a need of subtracting from the "program"? Or just making better exercise choices? Or improved coaching?
Just be aware.