How is that a remotely real comparison? The ansible mv function deals with preserving SELinux context, which mv doesn't do, and it automatically deals with a whole lot of common error conditions, whereas mv just fails. If you just want to replicate mv, Python has shutil.move, one line of code. Ansible is trying to do a lot more.

By the way, I don't know if this is the canonical implementation, but FreeBSD mv is 481 lines of C: https://github.com/freebsd/freebsd-src/blob/master/bin/mv/mv...