The last time I got a battery replacement for an Apple product was a few months ago, when I was living in Seattle a mere 30 minutes away from the University Village Apple store. From the time of my first phonecall to schedule the appointment to me walking out of the store with a new battery, three and a half weeks elapsed. I had to go to the store three times, the first time they merely "confirmed" what I had already told them on the phone and said they'd need to order the battery and it would take a week. What a fucking disaster, why didn't they order it when I called? Why did they give me an appointment when they knew they couldn't help me that day? Imagine if I was living an hour or two out of town, that would have been three afternoons of my short live wasted. Unacceptable.
It's shit. Unmitigated shit. With my old thinkpad I had new batteries mailed to me and it took mere seconds for me to swap them. I am never buying another computer from these shitheads. People who continue to support Apple have either gotten lucky, or they're nuts.
Therefore, Apple is only 'vouching' for the battery health of batteries replaced via a confirmed 'chain-of-custody'.
Could the message allow the health to be shown anyway? Sure... but it's not like a message pops up every time you wake your phone.
Doesn't that work against your argument? If you put in the effort to move the chip, the phone will never know you replaced the battery at all.
It's no riskier to trust the chip post-replacement than it is to trust the chip any other day of the year.