I use an iPhone 6 purchased Mar 2018 (it was obviously released earlier) and see absolutely no reason to upgrade. I nearly did late last year because of slownes

I use an iPhone 6 purchased Mar 2018 (it was obviously released earlier) and see absolutely no reason to upgrade. I nearly did late last year because of slowness, but thankfully someone determined the actual cause. Apple’s throttling based on the battery condition. Just waiting to have my battery replaced now and see no reason why I can’t use this phone well for another year at least.