I don't think the degradation of shear strength isn't much of a concern in the IDIs with normal oil change intervals. It's pretty good in all the oils and there really isn't a process inside that tears it up like the HPOPs and HEUI injectors do in the newer PS.
I don't know enough on the technical side about how to compare the chemistry components but soot and combustion gasses mixing with oil in the crankcase are where most of the wear comes from. Soot because the particles are smaller than what a stock filter catches and so pass through and continue wearing the internals. The blow-by mixes into the oil and ups the acidity which IIRC causes a chemical breakdown of the base oil. Even a freshly rebuilt IDI engine produces these in spades compared to the newest engines with much tighter tolerances, more efficient injection and additional emissions restrictions. I'll have to dig up some of my old oil analysis to reread but I don't remember sulfur being described as major contributor to the oil acidity. I thought it was more related to inefficient combustion from low cylinder temps like with long idle times. I think these are reasons to want the older style additive levels for these older engines.
The newer oils are labeled as backward compatible, but when accepting that I think it's even more important to stick to the recommended change intervals for your truck's driving conditions because there isn't likely as much wiggle room in the additive package as there used to be. Also, all these engines are far outside the warranty so there isn't the big hand of the OEMs to stand up and say these newer oil specs might be causing problems for older engines because they aren't paying any attention to them after they've past warranty.
Here are a couple videos where an Amsoil Lube guy discusses the changes in oil requirements from 2k to current. He's speaking mostly about how they relate to the newer engines and why bypass filtration is cost effective but he has some comments about the previous mid 90s oils as well and why the changes have had to be made. It kind of ties in with what the PDD guy was discussing.
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And here's Gale Banks discussing Soot in oil causing the destruction of the anti wear additive zincdiphyo??????????? from about 2:30. He says soot goes up as the engine works harder, which translates to more wear on components in a given oil change interval.
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