YMMV indeed. How does it go for folks who buy a device second hand, beyond apple care, perhaps because they can't afford Apple's first hand prices. No one is saying Apple shouldn't provide Apple care or first rate service within coverage. This is about a broader picture. As noted in the article Apple knows how long Apple care extends for any given device, and if components have been replaced. It would be fairly easy for them (and their gobs of money) to perhaps do something equitable like disable the replaced parts warnings once a device leaves apple care. IMO they shouldn't display those at all but in the interest of equity and compromise I'd settle for removal after Apple has self selected not to "care" about the device anymore.
Not really defending it as such, just offering my experience.
That being said if I was trying to see it from Apple’s perspective, it does address a lot of problems pretty easily: thieves breaking devices down for parts or coercing users, customers having issues with their devices due to low quality repairs, users buying second hand phones with unofficial parts, various security concerns, etc. Apple do also sell old and refurbished devices also.
That being said, I do think Apple should be solving this in a way that allows unofficial repairs, even if that involves taking your ID and proof of purchase into an Apple Store to get your device “unlocked” for free so you can do whatever you want with it, knowing it may hurt the resale value and impact the device’s security. More than that, I think it should be legally required under right to repair legislation.