I find with subtitle I am reading (or trying to) and missing what action is on the screen.
So why bother? I could read a book instead.
And whatever techs put the subtitles together need a better way. Too many times, the text is either in differing locations or it is light color text on light color background.
Netflix is bad about using half spoken English and half subtitles in some of their original series.
The "official" subtitles for Knights of Sidonia (Japanese sci-fi/mecha anime) were horrendous. I have the first two manga for it; whoever did the subtitles didn't bother to look at the source material, as some of the words were entirely wrong.