I don't get why Apple doesn't do consistent colors. I loved the blue of my iPhone 12 Pro, but I can't even get that anymore... I would have upgraded a few generatiosn back if they had kept consistent colors.
The materials used is a factor: the last few iPhones were built with aluminum (iPhone 16), titanium (iPhone 16 Pro) and stainless steel (iPhone 13 Pro).
Not all colors work with all materials; my understanding is titanium is particularly bad for bright colors. The colors for the iPhone Pro models have been pretty drab--not this year.