Once you know exactly how your prospects think and feel...
Think about it.
Your customers aren't in front of you while they are watching your video...
It's impossible for you to SEE the expressions on their faces OR how their emotions change throughout the duration of your video or sales pitch.
Without these insights, you're just GUESSING!
...And the only way for you to see these things is if somehow, some way, there was a way for you to be there in person with ALL of your viewers at the same time while they are watching your video.