iOS 13.1 brings controversial CPU throttling feature to 2018 iPhones
The controversial feature, if we can even call it that, will likely remain dormant for a while as most 2018 iPhone should still have their batteries in good health and won’t require throttling. As time goes by, however, those that have already racked up a high number of recharge cycles might see the performance of their phones drop. With iOS 13, Apple introduced a new feature called Optimized Battery Charging which should slow down the degradation of your iPhone's battery so that cases of throttling can become less common.
Still, if that happens to your device, you can fix it with a battery replacement. Apple currently charges $69 for 2018 and 2019 iPhones battery replacements and $49 for older ones if your device is out of warranty. A small price to pay compared to the cost of a new iPhone if you decide to upgrade instead.
On the bright side, the A12 Bionic chip that powers last year’s iPhones has top-notch performance so even if does get throttled, the effect on the user experience will likely be almost unnoticeable. Still, we’ll have to wait and see if users will start complaining about their iPhones feeling sluggish.