My iPhone 15 Pro Max experience has always been flawless, just like my previous 14 Pro Max.
The iPhone 16 Pro Max suffered from an annoying pixelation bug when shooting in ProRaw format. I reported this issue, along with other members, and it was resolved in iOS 18.3.
The iPhone 17 Pro Max introduced a new software bug, causing blurriness and exaggerated softness in images, mainly in wide camera. Telephoto camera has been really good to my standards.
I agree that this 'problem' will likely be resolved with iOS 26.1 or a later update. Changing the image pipeline and processing is a complex, non-trivial task.
More samples.
16PM vs 17PM ProRaw48 ProCam.