I can reproduce the focus issue at will because I understand the complaint
---with my iPhone 16 Pro Max locked down on a heavy tripod and using a remote bluetooth shutter release and the surface of the camera's image sensor in parallel with the detail (depth of field) I want in focus---
maybe my iPhone 16 Pro Max is defective, too -- maybe I don't know how to use the camera, either (tap focus, and zoom in to 100 percent to evaluate pixel sharpness)
but plenty of examples already posted on this thread illustrate what I am seeing here, too -- and some obvious user errors and unclarities in posts
u-tubers not talking about the issue are most likely involved with sponsors or agendas (if they are real camera operators or just editorializing their bias or weak expertise, or just not interested in the issue)
I am a firm believer in SEEING IS BELIEVING...
+++++
someone made the comment new posters aren't reading this thread before they post -- who can blame them -- this thread has become unreadable for most people except that they can see they are not the only ones, and at least one poster said they were told Apple is aware of the complaint
at that point I would just mark this "me too" and move on -- unless you want to have lengthy conversations and spend more time testing/ troubleshooting steps for Advisors who may or may not be keen or able to put your results in the hands of someone who can actually do something about it