I think it's a personal use deal, buy what you want / "need", I don't think there is a need to settle for anything, just have to expand your search area. But usually that's NE folks like me expanding our area out West, not talking search out by us for Salt Belt rigs, it's horrible out this way.
For me 6.4 has been fine, I think my 1500 is a 5.6 that seems too small but really it works for that ride.
My personal set up, I have a bunch of trailers and rarely would need an 8' bed. Just my use really.
I've always been amazed at the super low mile 2WD CC 8' Bed that pop up from time to time, not super often, but when they do, they stand out for sure, they don't seem to sell quickly either. They seem to sit much lower and are very long looking compared to the normal 4WD stuff around here.
Good luck in your search.
This one from 2020 was what I was thinking about, only had 30k miles. It's a very old example, but just truck wise it looks huge in the picture, great looking color and condition.