"The more severe, the more strategic it becomes.
The less severe, the more meaningless it becomes.
Severe bunkers cause golfers to think, plan and avoid them when possible.
They FACTOR into the mental side of the game, the strategy and play of the hole."
Not necessarily. I continue to believe that variety is a key element and if the bunkers are just pitch-outs, something is lost. A bunker can be so severe that no player will take the risk of playing near it. Sometimes a less severe bunker can be more strategic, not only by encouraging aggressive play to challenge the bunker -- because the bunker is seen as not penal, but also encourage aggressive play out of the bunker for the same reason -- it appears an easy shot. This is sometimes referred to as "enticing the player to do something dumb."