The oil specs superceed and the old ones become obsolete. Just because an oil doesn't list, for example, JASO DL-1 spec doesn't mean it won't exceed that standard. Certificiations cost and there are so many competing and obsolete ones that oil companies won't bother.
Requiring a CC/CD spec means that anything newer is also fine. Those are very old specs.
The 1HD-T doesn't have any special oil requirements. It's not a high speed diesel, it doesn't have EGR or DPF or unit injectors. It's not running under high stress or high temps. It doesn't suffer from abnormal cam wear or anything like that.
The biggest issue it has is cavitation in the big end bearings and the only way to manage that is to keep replacing the shells.
Ash content was a measure of the additive pack of an oil. But that measure is gone. Becaus EGR and DPF forced oil companies to produce additives which burned to almost no ash otherwise they clog up the DPF's.
If you're changing oil every 5,000-10,000km in a stock engine then you can use almost anything. IMO changing oil every 5,000km is a waste of money and oil for zero benefit.