I'm the one who said "five seconds for every dialogue" which you say never happens then link a video with a 5 second dialogue with no reply option. /Boggle
You talked specifically about "five seconds of fade to black" before delivery a line and "then another fade to black". Which, yes, it is absolute bullshit.
There's like a fraction of second, probably less than a third, before and after the line is delivered, for setting the camera up close and quickly bring it back.
Also, I'm not speedrunning the game, so any argument about how it would be "faster just reading" falls completely flat as far as I'm concerned, when the delivery and eventually the body language can add to their characters.