Again: We am not "padding" anything. The site exists since 2012, and we keep old job listings around, as an archive and to help find interesting potential employers that may have jobs apart of what is listed. There's an open ticket about "fading them out" a little to make it even more obvious. There's plenty of recent jobs listed, so your point about "only ever seeing jobs that no longer accept applications" is moot. Also, subscribe to the RSS feed (or Twitter/Facebook), and "all you will ever see will be fresh, open positions".

It's like arguing that a news site should delete yesterday's news instead of keeping an archive, because "you're only interested in today".

As for your "sustainability" and "career building", I disagree there too, but that's for a different conversation.