The Q&A suggested OCI for styles of driving but recommended 50k or 5 years.
With other posts about the potential longer life of regular oil, oil suppliers do not have control over filters apart from on new cars, and oil fiters have been a weak link in the extended OCI.
There is also public demand for cheap oil that can be changed every 3k miles and so oil companies build to spec required, and only when a car mft requests a longer OCI do the oil companies fulfill the need, the exception being Amsoil.
Leaving aside the solids issue, what is different about Synlube compared to other synths, or could these be run for an equally long period if there was a Public demand.
Interesting thread on BITOG re Racing oil and Auto rx being the ultimate and expensive oil.