I am a bit surprised we have never had a subject matter expert chime in on this situation in nearly 7 years of this thread existing. I am a member of many other forums, and at some point, an engineer who deeply understands the issue will provide information to the community.
On the topic of iPhone and PWM, I have never seen someone contribute in that way. Many of us are technologically savvy, and some of us, including myself, have been involved with software engineering and related areas for decades. I would love to see a hardware engineer who has experience with displays provide his or her thoughts on this topic. My brother-in-law is an electrical engineer, but he thinks in terms of buildings and structure versus computers and devices.
It would be amazing if someone from one of the Asian panel manufacturers could provide an overview of why PWM is still being used, how it's being used in various iPhones, and answer some of our other questions.