Email does indeed catch and notify you of most things, and Gmail is getting smarter every day. The one major downfall, though, is that it's stale: the minute you receive an email it's out of date, and if anything requires additional emails to send updates.
It's also those "filters and scripts" you've set up to create your own triage queue that we're trying to replace. The average user should not have to write scripts to receive and process their work in an efficient manner. That's what we're trying to solve at Monolist!