You seem to be stuck on blaming the vehicle instead of the people who are misdiagnosing it.
The first one might be given the benefit of the doubt but not the last 6. All car makes and models have gone through similar issues
If those people say they can’t find a problem and blindly replace the battery on a guess then they are not very knowledgeable so to speak when it comes to electrical issues. There is simply no way on God’s Green Earth that you got 7 bad batteries in 1.5 years.
There’s methodical process to this.
Load test battery,
Test alternator output.
Test for excessive parasitic battery drain. I do not know what the factor spec on the drain is but consider it around 50 Millamperes after everything goes to sleep.
It just boggles my mind that it got to this point and I have to wonder if the alternator replacement was also a wild guess on someone’s part. And then to add a battery disconnect to boot? That shold not be needed. Just my humble opinions.