The reason people do not call oop is it is very very difficult to bluff after calling a hand oop, especially post flop, which makes it hard to play air hands profitably. If you call one street you risk not giving yourself a profitable bluffing opportunity.

It has nothing to do with it being easier or more simple although that may be a byproduct. Also pantherhound to address your post it would be insanely stupid vs most players to c/r the flop in that situation. Slowing them down is a phrase that is too general for me. There are times where I try to do something that decreases the chances of someone bluffing because I predict I will fold to a bet on the next street and I want to make that fold as profitable as possible.