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You'll find that rod bearings do not cover the full face of most connecting rods due to having to insure clearance for the radius in the crankshaft journal. The high performance bearings can be even narrower than the standard passenger car pieces due to high performance crankshafts typically having a larger radius at their journal edges. Most high performance connecting rod bearings will be individually marked "upper" and "lower" in order to maximize bearing contact surface while maintaining adequate clearance for the journal's radius. If you'll examine the rods, you'll also notice that the rod will have a larger chamfer on the journal's radius side for the same reason.

As loading on the bearing increases, then the surface area for the bearing where it resides on the journal will also be appropriately increased either by journal diameter or bearing width to keep wear within reasonable levels.