My own experience has been that iOS 26 has improved the pwm/flicker for me.
So far, iOS 26 just feels a bit off for me. Granted, I only installed it last night, and used it in a low light environment, which reduces the phone's brightness, and that always feels worse.
This is on the 16e, which I've been able to use fairly well, without significant issues. But again, I mostly use it in well lit environments, where the phone's brightness is generally higher.
As to what feels off, difficult to pinpoint, but I'd say that it just seems overall less clear for me to read what's on the screen. Maybe a TD thing.
In any case, looking forward to hearing any iPhone 17 PWM Accessibility switch experiences, and I'll go into the Store myself on Friday.
Ughhhh ... why does Apple always have to try and make up something new to impress and make it "gorgeous", when it's not necessary -> i.e. iOS 26, which right now, simply seems gimmicky, and an unnecessary UI change.