Some interesting stuff going on here https://hq.getmatter.com/your-new-inbox

I tested Matter, but ended up not becoming a paid subscriber. Too many tools. I like their weekly newsletters where they round up suggested articles (not necessarily recent) from Twitter users and Matter as well.

I've had my eye on them for a while. They're definitely working on some fancy stuff. I prefer to go with a simpler/good-enough approach myself. (which is also reflected in the business models, as they're focusing on paid subs while I'm focusing on ads.)