I have july edition
I did some things that I will share with you , will maybe help , but dont know.
First of all , i dont have touch screen issues , but I did had a serious case of laging when typing , and had a missed types.
Now i will give all the steps I did , and from that moment the lag is gone , as well as missed typing.
First , go in keyboard settings and reset all keyboard settings. Than disable all stuff like , swipe to type , predictive text and so on.
Second , put two languages for typing , ect english us and english uk, and when laging starts just switch to another language and that is it.
After reseting keyboard and adding two lanhlguages , restart your phone and just use it.
There is no some crazy theory by my opinion that one build is bad and other is fine , and so on. Of course , there are some defectives phones , always will be too , but than again that is normal. Those that had defective phones probably recived new ones and that is it. And for the end , I am using magic jhon screen protector , but from day one I was using some cheap screen protector and there were a lot of laging , and since I put it on magic jhon screen protector , its also been better.
You will have ocasinal laging , but it will grately depend on app you are using , like viber , or whatsapp. What i constaly only see still laging is backspace key , but this is also not constant , its from time to time.
I think that apple has more throuble with wrong scaling UI and apps that it has with screens and touches...
That is it from my side