iohone 7 ios 16, why not?

hello, I have a question why the iPhone 7 is not compatible with IOS 16, after all the iPhone 7 is several times faster than the iPhone 6s and SE gen 1, it is not that much slower since the iPhone 8, it is a shame to destroy the iPhone 7 which changed a lot about apple phones, the first waterproofing, the first haptic home button, without a 3.5 mm jack
the iPhone 7 has performance on IOS 16 A10 fushion is 20x faster than A9 in iPhone 6s so I wonder why you decided to kill the iPhone 7