It replaces DNS's pull-based architecture (contact a DNS server to get the IP address) with a push-based one (push the IP addresses to each /etc/hosts file).

Suggesting that a push-based, Ansible-based architecture will scale to hundreds of thousands of targets, with such pushes happening hundreds if not thousands of times a day, is a junior-level idea at best, dark comedy if I'm being charitable, and professional malpractice at worst.