|Dennis M 1064
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The idea is to be able to keep the center of mass on the center of the tripod. By flopping the ball over, you have shifted everything to the side of the tripod head. With heavier lenses, you increase instability.
Also, if you shoot panoramas you need to keep your camera centered on a point, not swinging around a point.
On L brackets, at least with RRS, be sure to keep in mind with or without battery grip. Also not interchangeable.