I’ve built a few motors myself, obviously required a lot of research to learn how. My first oil change would be in 60 seconds of running the engine. Then 5-10 minutes. Than hard break-in procedure, change again. Than 100 miles, then 500 miles. Then 2000 miles. Then switch to full synthetic at normal intervals. That’s what a highly experienced engine builder taught me.
Yes a modern engine built by a major manufacturer will not need that. But it’s still an undeniable fact that all new engines will have lots of metal in the oil when they are brand new and you start driving it. There is plenty of evidence of this out there. There is no way the engine manufacturer wastes all that money to replicate a full genuine break in. 500+ miles of simulation is a lot of time and fuel.
How harmful it is to your engine is debatable, I mean that’s what oil filters are for. An oil filter should catch anything big enough to be harmful.
But combine that with the fact that there really isn’t any incentive for the manufacturer to recommend an early oil change. These things usually do not effect engines in short term.
Personally, I don’t know if it’s necessary, but I’m definitely not waiting 10k miles. I intend to do the first oil change at 1-2k, but I will probably procrastinate to 3k-4k miles.