I'll repeat what I said to clarify it for you.
- Person checks their battery health and sees their battery is no good.
- Person gets battery replaced at third party shop (or does it themselves).
- Person checks battery health after replacement to make sure everything is OK.
- Person sees warning message that the battery can't be verified as an Apple authorized battery and health information is unavailable.
Please explain to me how any sane person would ever go back to Apple because they think there's a problem with their iPhone? Are you suggesting the person who just had their battery replaced and is now showing a message isn't going to instantly realize the battery replacement is the cause for the warning message? Seriously?
That's the same as a person getting their tires replaced at a tire shop, having a wheel fall off their car on the way home and going "Gee, I better go back to Ford and complain about my defective vehicle."
And yes, since this is now common knowledge among repair shops, they have an obligation to warn the customer that they will get a warning message after changing the battery. If they don't they are negligent. As does iFixit to all the people who buy replacement batteries.
Edited: Just checked the iFixit website and they have this disclaimer posted along with their battery kits:
So yes, I stand by my claim that repair facilities are obligated to notify customers BEFORE their battery is replaced.