The Google Pixel 7P that I have now I bought because I dropped the 6P on the ground so bad that it wouldn’t even start. The 6P I got because it had significantly better camera and was faster than the OnePlus 6T I had before. I know you say 100mp doesn’t make a difference from 12mp but there’s really a huge difference in image quality with the Pixel compared to the 6T, especially in low-light conditions or when you zoom. And it’s not just me, people have been commenting at how good the pictures are without even knowing what phone I own.
I also enjoy new features like the gestures to control apps. Overall, apps and the OS get slower because new features keep being added, and security updates stop coming, so I need to renew the hardware to keep up. I use the phone for hours a day every day, all year around, so I think it’s worth putting some money into it. But I don’t get a new one every year. Maybe 3 years, or possibly 2 years depending on what gets released.