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To keep disk brakes from dragging, a slight amount of lateral bearing play does the trick as this allows the wheel to wobble left to right forcing the calipers to spread the pads away from the rotor.
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I disagree with that theory. The square o-rings used inside the calipers as piston seals have enough spring-back that they pull the piston away from the pads. Otherwise, brakes would always drag until the brake rotor turned a few times, and that is demonstrably not the case.
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No, I am referring to actual drag of the shoes on the drum. That drag will be very minimal or even non existent just before the shoes have worn enough for the automatic adjusting mechanism to click a notch. but just after it does that there is often drag.
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If you say so. Regular use of the parking brake is needed in my cars to make the adjusters move. I have not noticed any drag, other than what is in the bearings and the bearing seals.