Yep this is what drove me to be comfortable going to 10k between changes.
If you want to know how much money you are wasting on old school thinking, pull a sample and send to Blackstone.
They will dispel the myths on the 3k or even 5k oil changes.
I ran my dirty old Cummins diesel to almost 11k and they said I could probably go to 12k with confidence. And this was with straight old Rotella oil, no synthetic oil.
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Use oil analysis will confirm or expose oil condition.
It's not something that a blanket statement like yours will cover
Different engines, oils and driving conditions do effect how long the oil can go.
Also..Shell Rotella T4 is synthetic.
The big three Delvac, Rotella and Delo have been synthetic or blends for years
They all still make a non synthetic but the names are different