Using the vertical line count is a legacy of CRT displays and analogue connectivity/broadcasting where there was no horizontal pixel count only a maximum frequency due to the nature of the technology. There were 1080i CRTs so it is only for the next generation it is possible to change to the terminology used in cinema and professionally for some time.
Every pixel on a 1920x1080 display is replaced by four pixels on a 4K display so I'm not sure a "4 times the detail" type statement is particularly wrong or misleading. It just doesn't derive from 4000 = 4 x 1080 type logic.
Every pixel on a 1920x1080 display is replaced by four pixels on a 4K display so I'm not sure a "4 times the detail" type statement is particularly wrong or misleading. It just doesn't derive from 4000 = 4 x 1080 type logic.