When you really get down to it, most people that own a truck or a “truck” really don’t use the bed very often at all. The construction trades being one of a few exceptions. My wife has a 2017 crew cab short bed Ram 1500 and rarely do we use the bed. We use the Ram boxes on the side of the bed at least twice a week though.
When you don’t have a truck, you make do with what you do have. My wife used to tell me that her old Honda Civic was the best SUV she has ever owned, because she used it like it was an SUV. Be it bricks for flower garden trim or 10 bags of mulch/soil. You make do with what you have.
So in that respect, it makes sense why auto manufacturers are getting away from 8’ beds. People would rather have a truck that rides like a car, drives like an SUV, and has 29 cup holders instead of a truck that can work, and have longevity while doing so. It’s just the way our society is changing.
Give me a small, regular cab or extended cab truck with a diesel engine in it and an 8’ bed and I’d be happy.