#PostEmbed / #EmbeddedPost / #QuotePost / #PostQuote
(Also mislabeled as #QuoteRetweet / #QRT, despite the fact that other sites, like Tumblr, do it better.)

I think this one is inevitable, in the sense that, with all the content creators who want this, especially journalists fleeing Twitter, someone is going to build some sort of standardized patch to allow this functionality, and then a chunk of the servers will have it, unless it's implemented in the main build before it catches on. People have been asking for this one for years, some way to cohesively embed someone else's post within Mastodon, and right now, we see tons of different ways people are trying to work around not having that feature: links, screenshots, boosted replies, etc. Eventually, at the very least, someone is going to say "links to Mastodon posts should embed themselves like other links." and from then the cat's out of the bag.