Clevy,
If we were discussing a MPI vehicle, I would agree 100%.
I think the issue is that with the d.i. engine UOA's we have seen, dilution has become an issue as soon as 4k miles no matter the oil. Granted, its not every d.i. engine, but definitely most. Folks equate dilution with wear (how much of this dilution is detrimental is yet to be seen). Because of this, d.i. owners are tending to error on the side of caution when it comes to oci. Heck even my owners manual calls for 3k mile oci in severe conditions and 5k in normal. A waste for me, is using a syn for only 3k miles as that is the oci my conditions call for. The OLM in GM vehicles just seems to compound the issue from what im reading, since its advising one thing yet dilution found in uoa's (and ocd) is advising another.
Plus, for some it isnt time wasted and the used oil isn't poured down a storm drane, its recycled.
Not an expert, just my 2 cents.