There have been huge architectural changes under the hood. Granted, most end users are oblivious to them (eg. Neural Engine generational changes, GPU, SoC, etc)
FWIW, iOS 15 updates are still being released for these devices. A. week ago[1], in fact.
FWIW, iOS 15 updates are still being released for these devices. A. week ago[1], in fact.
1. https://support.apple.com/en-us/HT213913