Either you send too much in a post, or too little. And it all hinges on how the receiving end renders it.
I don’t think anyone should worry about that. Make and send posts based on what you want to say, not how other software will render it. Its up to the software to fix their shortcomings. We’ve seen a huge influx of Link/Page posts from threadiverse users and now we’ll see an influx of Article posts from wordpress users. This is what the fediverse is supposed to be and projects that actually want to be part of the fediverse have to be able to render it all nicely. (This doesn’t mean first-class support for every type. Changing how you render a few fields like title, content, author, summary by post type isn’t a huge ask).