I think the reason there's so much controversy about the particulars of oil (and SO many things) is because there's no obvious and clear BEST product for everyone's situation. If you used the forums' "best" and "worst" oil, I'd doubt you'd see any significant difference unless you were running that motor for 100,000 miles per year. At that point, you likely have to measure differences in wear with equipment better than .0005 indication.
A friend gets so wrapped around the axles about this sort of controversy that becomes paralyzed and cannot take a decision.
For the record, I pulled my 73 L24 at about 130K miles in mid 80s for a refurb. There were no real problems, just looking for optimum performance. Original honing scratches were still present, seals were still in decent shape (most were hard but still keeping oil on the correct side - for the most part. This was all based on technology that is now 40 years old.
Maybe it's a bit like the guy who bought a new H&K and ran 15,000 rounds through it before he cleaned it. It continued to operate properly and well. Lubricant technology development in the intervening years has become quite sophisticated and yielded amazing improvements in friction and wear reduction.
I'd probably bet that the lowest cost crap oil you can find at AutoZone would far surpass the performance of the best oils of the day 40 years ago, which suggests that decent oil today should keep them running well past our life exoectancy, but that's just me, and I've had a cocktail!