[schadara]

Supposedly, Apple didn't "implement" battery throttling on the iPhone 5S - Apple's discount battery replacement program only applied to the iPhone 6 and up. This suggests that Apple switched to a flawed battery technology in hardware starting in the iPhone 6 that wasn't realized until years later. And, instead of issuing a recall or repair program, they pushed a silent cover up in the software. Whatever the motive, they should have been more open about it.

I had an iPhone 5S that ran ok until I upgraded to iOS 13, IIRC. After that, the frames started skipping and it became frustrating to use.