Wrong. You can't determine an 'optimum' drain interval from one or two tests. You'd have to run many many oil analysis's starting at about 2000 miles up thru perhaps 10,000 miles on the same oil and filter to see how it charts out. And then you'd have to repeat it several times to turn it into something statistically significant. By the time you got done, as an individual user, you'd have just about worn out the vehicle. And you'll never know what's "optimum" until you've run a statistically significant number of vehicles PAST the point of optimality just to find out where it is at. So again, as in individual user with individual driving habits, you would wind up wearing out your car just collecting your data. That's why it's only of value when you have a fleet of locomotives or semi's that are all operating under the same conditions over and over again and you have lots of them to develop your baseline data with. It would probably take years to develop useful info like that if you really wanted it to be meaningful.
You're talking like someone who has no idea what would be required to develop something meaningful.
That has nothing to do with what's optimum, it's just what everyone already knew, that automakers call for change internals that are way too short for today's oil. Nothing is provided showing just what mileage is truly optimum. You are right back where you started.