Something to consider on this silly "if you don't agree with me... you are just simply wrong!" argument:
Newer cars (past 10-15 years) are now using engine oil not only as a lubricant, but also as hydraulic fluid to control such things as variable valve timing and timing advancement systems and the cooling processors on the nuclear reactors and flux capacitors and stuff. But seriously.... the oil passages to the timing advancement gears on the cams are very itty-bitty and can clog up with sludge easily. It is not like Grandpa's old 1973 "deuce and a quarter" that all that you had to worry about was slippery oil. The lubricating properties of modern synthetic oils do, in fact, allow increased change mileage. However, the additive packages, even tho much improved, still tend to have issues with fighting sludge. And it can/will build if left in use too long. Once these tiny oil control passages get sludged and clogged up, the big head-achs and wallet drainage begins. My point is high mileage oil may stay nice and slippery, but it can still sludge things up if left too long. There is a ton of evidence and videos to support this.
Simply put, if you get a warm-fuzzy from changing the oil after every "trip to the grocery store" as Chef joked.... than do it. That is still better than going 20K miles on ANY oil and suffering the cost and waste of a perfectly good engine. The truth (as always) is somewhere in the middle. We all have our opinions and suggestions.... and fortunately, we don't have to pay for each of our fellow forum member's mistakes. May we all have the longevity results we wish for.
Happy Holidays to all of you nice folks!