I'm an Amazon product leader and I agree 100%, I'm already in back to back meetings all day long, emailing me a doc to read "in advance" puts all the stress on me. I'd rather you put time on my calendar and let me read quietly, and let me give you immediate feedback rather than me having to draft yet another email in reply to poorly explain my questions and/or my ideas.
I also block time in my own calendar, I have to write, a lot, and I have to work with my team on docs and other outputs. I block my calendar for those times, if you want me to read you know clearly when I have time to read with you, just grab a free slot on my calendar (in my timezone please lol). I am happy to provide the time, enjoy learning new things, enjoy sharing my thoughts, and often I can help find the right next person to read with you, or sponsor a leader to read with you.
Now all this said, I do find it a bit intense, to read "on the spot" and provide feedback, that said I will often provide feedback and suggest a follow-up meeting so I can noodle on the topic some. Meanwhile the author can spend time getting other input, improve the doc, and come back with a stronger story.
The best part for me: On-boarding!
When new people join I share major docs that were important to my team's plans, and some of them date back several years! I can share the doc with the new hire, ask them to block time for read + Q&A. It saves time getting them up to speed on our thinking, and we can discuss "so where are we on this journey" rather than spending time telling the full story for the 1,000th time.
When I joined Amazon I was an "Orator" style product manager, I would "tell the story" over and over, sometimes with some power point. And it was successful, however I feel like me and my teams are many times more successful with a strong doc process. And in the end decisions are memorialized, we don't have to go back and hash them over and over.
I was an entrepreneur for 25 years of my career, and CEO all those years. At Amazon I feel like I get the best of both worlds, the ability to innovate, invent, and the ability to do it at scale without pitching 100 VC's my next idea.