merc_g, thanks for the 12 Pro and 12 Pro Max comparison photos. I see NO close focus issue at all with the 12 Pro pic. Your 12 Pro photo matches what I can get with my wife's 11 Pro Max. I'd have no complaint if I could get this from my 12 Pro Max. I would reiterate that the main cameras (i.e., the "wide") of the 12 Pro and 12 Pro Max could not be more different. The main camera on the 12 Pro is the same as the regular 12--same lens using optical image stabilization (OIS) and the same sensor. The 12 Pro Max lens doesn't have OIS, its sensor is almost 50% larger (which would negatively impact the minimum close focusing distance) and stabilization is achieved via sensor shift technology.
A few experiments I've done recently to try and isolate the problem:
1) Theory: the new addition of lidar is the cause of the close focus issues. Experiment: I blocked the liar element so it could not influence close focus. Result: No difference in close focus problems. Conclusion: Lidar does not seem to be the cause of the problem since the problem persists without lidar involved.
2) Theory: there's a software issue with autofocus that's not allowing the camera to focus as closely as it could. Experiment: Shoot with ProCamera app in manual focus mode to override autofocus. Result: No difference in close focus problems. Conclusion: Apple software that governs autofocus does not seem to be the cause of the issue since the problem persists using manual focus.
3) Theory: close focus issues only happen in indoor, lower light settings. (I read this in a pro photographer's analysis of the close focus issue.) Experiment: Shoot close focus subjects outside in bright daylight. Result: No difference in close focus problems. Conclusion: Low light does to seem to be the cause of the issue since the problem persists in bright light.