Anything updated periodically probably works better with RSS (subscription model), while sites like Hacker News seem better at aggregating interesting scattered

Anything updated periodically probably works better with RSS (subscription model), while sites like Hacker News seem better at aggregating interesting scattered content (and hosting the resulting discussion). There's certainly room for overlap (e.g. "look at the interesting post on this blog, subscribe if you like it"), but people submitting every single update as they occur will probably detract from the signal here.