The confusion comes from several sources, including oil life monitors and manufacturer recommendations. I mean if a guy buys a car and does what the manual says or goes by the oil life monitor, I can’t fault him.
Like you, I change oil at 5k miles. I didn’t reset the oil monitor on my 2005 Buick once, just to see when it would tell me to change it. It was around 9k miles. That was with quite a bit of highway driving, though.
When we bought a 2013 Toyota, it came with “Toyota Care”. Toyota doesn’t (or didn’t) have an oil life moniter. Rather, you’d get a “maintenance required” message at 5k mile intervals. The dealer refused to change my oil under the “Yota Care” program at 5k. So I just did it myself and had it changed again at 10k under the program. But I wouldn’t blame someone if they waited until 10k, since that’s what the people who sold them the car are telling them to do.
One of my best friends in college is now an engineer for Honda. He said he followed the oil monitor on his Yukon, going up to 10k on an oil change. He traded it at over 100k miles with no issues. So maybe it works ok to some extent to extend the interval. But I’m too cautious. And I shoot for at least 200k miles before I trade.