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I agree, on the surface, it would seem so. 30 years and more ago, often the cam bearings were not changed when rebuilding automotive and light truck engines. I do not know about today, as my engine rebuilding ended in mid 1980's. The differences here are special Diesel engine. (multifuel) Gear...

I'd use something like this: Permatex® Ultra Slick™ Engine Assembly Lube Proper lubrication of metal mating surfaces is essential prior to starting a new or rebuilt engine. Ultra Slick™ adheres to component surfaces to prevent scuffing and galling during initial start-up. This high quality...

To put it simply, with a gear drive, there is a force trying to push the gears apart that is countered by the upper part of the cam bearing. This force adds to the force created by the cams pushing on the tappets. The force on a gear drive is the opposite of a chain drive. What they are now...

My thoughts - could be wrong. Sharp corner = stress raiser. Cyclical torque loading of shaft causes cyclical deflection and metal fatigue.