Thanks for your detailed response and the two outside resources you linked to--very helpful.
To be clear, the blogs I’m referring to in my original message are made from curated content and aren’t part of a larger topic cluster. In most cases, it doesn’t make sense to redirect them to a pillar page or other content in one of our clusters.
So to clarify a couple remaining questions based on your feedback:
1. It doesn’t matter too much when we choose to delete/301 redirect old blogs that aren’t performing and can’t be improved by updating. What’s important is that we routinely audit these blogs to decide which to update and which to delete/301 redirect. Is that right?
2. If there’s no relevant pillar page, cluster content, or more recent/thorough blog to redirect an old blog to, it’s best to just redirect to the main blog listing page (“/blog/”), or to the relevant blog tag/category if there is one. Is that right?