My viewing experience has improved so much since committing to subtitles that I just assume people who are "against it" are missing a decent chunk of the dialog

My viewing experience has improved so much since committing to subtitles that I just assume people who are "against it" are missing a decent chunk of the dialog. I went to a ROMCOM in theaters and still couldn't make out the lines -- it's the mumbling and sound mixing. Without subtitles on an action movie...how do you hear anything the actors say?