It’s much easier to get people on board with what you’re saying if their eyes haven’t glazed over by the third line.
Despite being used by virtually everyone, we know that the human brain doesn’t absorb and retain information in the way that most people use the PDF.
There is so much psychological evidence demonstrating that we consume information better if it’s displayed in short bursts with lots of visuals to break it up, but very few PDFs come near to offering this kind of experience.