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When you are cruising along at 120mph that long driveshaft is spinning pretty fast.
It must be perfectly straight and balanced, or the vibrations would bounce the tires off the pavement.
Shorter shafts are not as vulnerable to being unbalanced.
Vibrations only affect half of the drive train.
Also consider if you were using a 1/2 drive impact socket gun to drive a three foot 1/4 drive extension.
(not that you ever would of course).
The extension would twist up like a pretzel before any work was created.
A series of six inch extensions would have been much stronger. 1.2.3.4.5.6.
Shorter is mightier. Roman sword.
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