like watching TV with subtitles
Subtitles are great when the volume is way too low, it's in a language you aren't proficient in or the person is talking in a language he isn't proficient in.
For the sort of slides being suggested here to work requires a lot from the topic being presented, the presenter and the audience. Only follow this advice if you're confident that all three components will line up for you.
I also dislike presentations that have been written in Latex/Markdown and then converted to slides. Slides aren't just a different format to render a document into, they're there to support what a person's saying.