I think this is a great post but I have to argue on the simplicity of "strength is strength". It really isn't and I am speaking from an athletic prospective. Just because one can display power and strength in a weight room on a SAGITTAL plain does not mean that he/she cannot display it laterally. That's were the difference in training modalities comes in. Take a sprinter just as an example. Just because he has the power to run at full speed in a lineal sprint (stride length x stride frequency = speed and speed inevitably is power ) doesn't mean he has the power or joint integrity to change direction or properly decelerate.
A good example of this would be Milos and his leg injury when he tried to sprint a 40, tore his vastus medialis, torn ACL among a myriad of other injuries in that same run. Last year there was a record number of hamstring injuries in the NFL because of the lock and either not training or improper training. My point is that all training isn't the same. You just can't bench, squat, deadlift and power clean. The training has to be designed to the specific athlete within the needs of his/her sport.
I actually agree with everything you posted.
Maybe my first statement was a gross generalization. But I believe we're actually saying the same things, more or less.
Simply, that strength in one plane/activity doesn't translate to strength in another. Force and power are there in any trained athlete. The ability to coordinate muscle fiber power into a new activity, though, will always require training, repetition and coaching if very complex.
It's the same way an Olympic Lifter can't bench press the way a powerlifter can, yet both are athletic, strong, forceful and powerful. But each has learned patterns specific to their activity.
Or as Coach points out, deceleration is not something a 100m sprinter works on. So they aren't functionally strong in that activity. Yet a running back in the NFL cannot succeed without being able to deccelerate at a ridiculous rate. Both are forceful and as powerful as can be. Therefore, they are both strong. But each has chose to specialize that strength on an activity that maximizes athletic outcomes.
Strength is a qualitative descriptor for the quantitative force generating properties of a muscle fiber, which are derived from the power a fiber can create. Muscles are therefore trained to be powerful. The plane/activity in which we choose to train them defines the functionality of our power, hence the functionality of the force we can create, hence the functionality of our strength.
But one can always argue the qualitative merits one type of functionality over another. Is the bodybuilder's functional strength any less useful than the running back, or the O-lifter, or the discus thrower, or the hay-bailer? If money is used to define the value of the functionality, then the answer is yes, for the most part. :-)