These are great examples of the value Acquia Cloud hooks provide. Glad you're enjoying them to avoid your nightmare scenarios, and sleep better at night.
In fact Acquia runs that hooks only if you updates code, or copies db etc. from Acquia Workflow page only. They do not work if you just push commit/tag. See https://forums.acquia.com/acquia-products-and-services/dev-cloud/acquia-cloud-hook-post-commit