But you might run the blog with someone who isn't. Or be running the blog for someone else. Setting up varnish is another option that's likely even better (didn't read the details of the post, but it looks like it always hits a php script to get the cache).

I think integrating wordpress-like administration systems with static publishing systems should be a major goal. That's how movable-type used to work in the old days, and it was great. Now that we have client-side plugins like Disqus for dynamic interactivity features, there's no need for published content to be dynamically rendered. It's all downside and no upside, other than, "wordpress exists".

Setting up redis very simple. Ditching WP isn't.

I found ditching WP very simple, and unlike adding redis, you can even ditch your host and stick your files on S3. My quality of life improved dramatically once I didn't have to keep patching wordpress, breaking all my plugins every 6 weeks, and still getting hacked once in awhile anyway.