I tested my friends 6s after it was noticeably slow in even basic built-in interface navigation like settings or msgs, I did an antutu benchmark and he got half the score of published antutu results for the then flagship phone. It's ridiculous how far many people are going to defend the worlds biggest company when things are so obvious. My wife's xiaomi note is still going strong after a year without any performance degradation and/or battery issues. I wonder even if apple is not deliberately slowing it down they realised its happpening and never bothered to improve the battery life - the result? Billions of additonal revenue when users feel their phone is slow for the latest software and upgrade the hardware without any benefits for them other than removing restrictions forced by Apple. It's a shame and the company deserves to be shamed!
P.s the CPU and GPU scores both were noticeably lower (almost half) for otherwise perfect phone. Remember it's once benchmark score could still beat most Android flagships if not for the artificially introduced throttling by Apple..