For my two cents worth, I really like the idea of integrating the response box into the content.
💬 Why I Haven’t Embraced WordPress Blocks
David Shanske (david.shanske.com)Indieweb Post Kinds actually does a few different things. It creates a taxonomy to classify posts, similar to the old post formats options. This just allows for automatic creation of archives. I also use the selector to change the interface, but this could be done differently. It also uses Parse This to create rich embeds of linked content. But it adds the microformats for different types of Indieweb posts outside of the traditional content block using WordPress filters. That is something I never particularly liked, and wouldn’t mind replacing with something integrated into content.
I have long been intrigued by this David, so thank you for sharing. I have tinkered with blocks in my long form site, but still see it as overkill most things.