Exactly, why are so many people missing this point. It's not "we built a narrow, tedious framework for knocking off Twitter clones", it's "We built a platform that turns data processing on its head and look in a couple of months you can clone Twitter just imagine what YOU can do with this."
I see parallels though to Datomic, where they turned the database inside out, co-located the app logic and data and indexes, etc. There are a bunch of great videos on YT about Datomic by Rich Hickey & co, worth a watch and I think shine a light on the approach here, too.
I think they didn't do a good job making the point clear for people who just clicked the link without context. It starts off talking a lot about the Mastodon clone and then gradually starts talking about Rama as it goes.