40th GP. You are correct for the most part, except there is something you are forgetting.
When you shut the engine off the valvetrain and all is filled with oil, all of this oil drains back through the filter and will push unfiltered oil back into the engine.
My dad had issues with Frams on his 97 chevy pickup. He would have lifters tapping every morning because of it. Once he switched to WIX it never happened again. He still uses the truck for plowing, haven't heard a lifter tap for 10 years.
This doesn't mean Fram didn't fix the problem, who knows a lot can happen in 10 years right?