If you search Dan’s comments for "software sandwich" you’ll find https://news.ycombinator.com/item?id=10742610. I’m not sure if there are any other comments mentioning the system, or what became of it.
Suffice to say, it’s not possible to have an interesting front page every day unless there are a pool of reviewers whose job it is to go looking for interesting stories. It’s too much of a schlep for anyone to want to do it otherwise.
I've recommended items to that myself (from other people), via email to mods. Those are usually accepted, though not always.
If you’re interested, I encourage you to email and ask if you can join. They’ve probably long filled the team that does it, but it’s always worth asking if you want to do some yeoman work. But one tip: it’s work, not fun, so if you do pursue it, be sure to go into it with that mindset.
To be honest, I doubt they need any help nowadays. The system has been working well for nearly a decade. But you never know till you try.