Caching is hard. Drupal used to, may still use the dB for caches. So you get pool issues. You have to also throttle features, like site Search or other intensive scripts. So in the main the internal caching is a step up from none.
Not totally weather resistant. And you likely need to stand it up on stone, or waterproof foundation. Walls need good capping. Good eaves help, but once you are at this kind of structure, tmberframe or concrete column, with any old in fill may do.
Many modern concretes are blends, papercrete, hempcrete, timbercrete, benefit from breathability.
Rammed earth at least benefits from reusable form work. And I reckon could easily be automated.
Clay and straw is a classic too.
A mix of materials a good idea, especially given building sand scarcity and environmental destruction.