Ansible is imperativ and applies changes to a starting state. Immutable distros replicate a known state 100%, which is in every respect superior and prevents nasty surprises Immutable distros are 100% reproducible from a config file, which is a big thing for cyber security, building software etc. Debian has too many packages given the amount of contributors they have.
So does Ansible. Pick something like Alpine and destroy and recreate instances whenever you need to change your setup. Done.