I think the bigger reason was Ansible needed to support Python 2.4 and 2.5 for old CentOS versions, making simultaneous Python 3 support very hard. They've now

I think the bigger reason was Ansible needed to support Python 2.4 and 2.5 for old CentOS versions, making simultaneous Python 3 support very hard. They've now dropped 2.4 and 2.5, thus allowing Python 3 compatibility. https://github.com/ansible/ansible/pull/22721/files https://github.com/ansible/ansible/pull/22721/files (Though, it's worth noting that CentOS still does not have Python 3 support out of the box.)