My guess is that the 3-4 defense is built on larger, more beefy players on the front seven because the D-Linemen need to take on more double teams and the LBs are more often combatting O-Linemen one-v-one.
That, to me, screams built for bad weather where the weight advantage of your bigger D-linemen and beefier LBs are not as effected since the games slows down across the board.
In a dome, it is always perfect weather conditions on a fast surface which lends itself to a faster defense, i.e. a 4-3 defense.
Complete conjecture on my part but take advantage of those 8 games you play in your house.
Walk Worthy,
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Thad
The future is so bright; I gotta triple up! 
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