No one reads long emails. I similarly noticed that people don't miss things in my email when I format them like texts or discord messages. He wasn't writing up technical requirements for Moviemaker, he was just sharing his experiences. I also suspect that most people that are as busy as him mainly use their phone to access email. I know 90% of the time I've heard back from, who I consider, busy people, there was a "sent from my iphone" signature in the email footer.