Whatever a diagonal rotation essentially is the same like using a big display of classic aspect ratio with two corners blocked. What is the benefit of not havin

Whatever a diagonal rotation essentially is the same like using a big display of classic aspect ratio with two corners blocked. What is the benefit of not having these corners present? Why not just buy a 45-inch 4k display, put it right in front of you (instead of a TV-like distance) and use it with 100% (or close to it, maybe also tweak some fonts) scaling? I actually do it this way and I fail to understand how can a wide&low display placed diagonally feel better.