I've been preaching this for as long as I've been posting here. The algorithms these devices use are based on data collected over literally millions of miles (or equivalent). They account for modern lubricant technology--reflected in the latest API and ILSAC standards.
Most of us old farts grew up on a steady diet of 3,000 mile oil changes, and that was wisdom based on years of experience. The fact is, that wisdom simply doesn't apply anymore, but old habits die hard.