Hey iFolks :-) see what i did there?
First let me say that I absolutely see what you are all saying, AND I think you have an argument for a return. But I am not so sure this is a widespread problem. I say this for multiple reasons. The lack of most apple support personnel knowing about the issue is one. Reason 2, I havent seen widespread reporting of it on the news coverage sites about apple. (macrumors, 9to5mac, CNET, Forbes technology etc) I haven't seen it as large scale reported in Reddit either. From my experience, and I preordered my 15ProMax, i dont have the issue. THe photos here are from iPhone13 and iPhone 15 proMax selfie lenses. Both phones were set to Auto, basically with as much matching settings as I could.
Apple iPhone 13 Pro
ƒ/2.2 1/60 2.71mm ISO200
Apple iPhone 15 Pro Max ƒ/1.9 1/60 ISO100
.....and turns out I cant upload and insert the native formats here. Can only insert .jpg in this post...here is a screenshot of the native shots. THe screenshot is JPG but the differences to me are miniscule.

Photo on left is the 15. It definitely looks less processed...i mean my skin ugh
James