Love that you too are thinking about how macro posts are treated on the timeline compared to the micro ones. I’ve raised this issue frequently in the past but I’m usually told that’s not a priority or conceptually, I should not give undue importance to how it is presented.
To @jsonbecker’s point, Micro.blog even has a OG plugin but it’s useful only on platforms that support it but ironically, not on the Micro.blog timeline.
So now, I’m using an entire text-based solution as devised by @laura in this awesome thread. But it involves mucking around in the feed file which breaks other things e.g., “displaying a post in full with 600 as opposed to 300 characters when using a blockquote” is not supported with this hack. Also, the summary text doesn’t support HTML tags so they will be stripped from the summary on the timeline.