Nikon started to optimize screens for brightness starting from F4. From F4 onwards screens have displayed the depth of field by f/2 at maximum, even if you had a 1.2 lens plugged in. A nice shortcut for getting loads of OOF images

It didn't matter since pro standard switched from 1.4 primes to 2.8 zooms. Consumers switched from 2.0-2.8 primes to 5.6 zooms.

Also AF points are clustered in the middle, so you need to do some recomposing if you want to focus elsewhere. In fast moving situations paying attention to some tiny blinking lights in the edge of your vision is not optimal either.