Assuming you missed the part that said "3rd Generation"?Never mind, I see what I missed
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Yep, the whole iPod Touch 7 released a week before WWDC with no changes other than an upgrade to the A10 (and 2 GB of RAM) suggests that at one point they were planning to bring iOS 13 to all A8 devices, but during testing the devices with only 1 GB of RAM just were performing well and the decision was made to cut A8 devices with 1 GB of RAM. They then had to come up with a replacement for the Touch 7 before WWDC...If someone feels that not having the latest OS is being "left behind" then they need to upgrade their phone. If you're still using an iPhone 6 in 2019 you're already behind. Saying that because they got Apple to install a new battery for $29 doesn't mean they have a new phone.
I have the feeling that Apple tested it on the iPhone 6 but performance was subpar. Can you imagine the complaints if people updated their iPhone 6 and it was even ten percent slower. All you would hear is "Apple is forcing me to buy a new phone"