"what a silly uninformed statement"
Actually its you who are silly and uninformed Wiz.
Unless the original designer of the particular component was a cretin, the bush concerned would have been designed to operate at the maximum allowable pressure velocity (PV) allowable for leaded bronze bearings.
Why? Because the designer needed to save weight. Why do you think the shaft was scored in the first place? An automotive designer would have simply increased shaft diameter and lowered the PV, then you wouldn't care if it was aluminium bronze or leaded bronze since Aluminium bronze actualy has a higher PV than Leaded, but it doesn't do as well dealing with embedded particles as the ATSB report appendix and every machine design manual will tell you.
You must obviously also subscribe to the theory that aircraft parts are way overpriced because they look exactly like their automotive counterparts don't they?
Try telling that to the families of those killed in Helicopter crashes where substitute parts have been used.
I mean a "washer" is just a "washer" isn't it? A "nut" is just a "nut" right? You can replace a wheel bearing with one bought for a few bucks from Repco can you? Try substituting a repco fuel pump for an aviation one and see how long it lasts.
Aircraft are light because the components that make them up are light. As a result loads are higher. To provide the requisite safety factors, the materials, manufacturing processes and quality control is much stricter.
The differences are often very subtle, and in the case of this particular bearing, they were tragic.