The six-year-old iPhone 6S will get iOS 15, and that rules
theverge.com
theverge.com
Alas probably the majority of the devices, even if kernel drivers do get good, will probably forever be stuck with locked bootloaders & their obsolete, radically insecure operating systems. This chip is from 2017, and pretty soon, most of these devices will be good only for land fills or e-recycling.