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“Optimization” would literally mean installing a cache plugin in 2 minutes.

I’m no WP expert but maybe they have a good reason to leave caching out of the core.

Plenty of organizations in which the marketing or PR department maintains the company blog, not their core IT staff. This is likely their "good reason".

Unpatched WP instances full of vulns are also rampant for this reason.

OP meant the Wordpress devs should at this point include the caching plugin in the core install and enable it by default.

I'm not a WP expert either, but I did implement a CMS for my company. Caching interferes with people editing the site and getting to see the updates immediately, and the easy way out of that is to disable caching. My guess is that default WP takes the easy way out, because of their largely untrained userbase.

That's interesting. Most of the WP cache plugins I've seen handle that by bypassing the cache for logged in users.

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