Again, my advice is to take some time and learn the tools before discussing their strengths and weaknesses.

You missed more Ansible strengths, like detecting changes and restarting only affected services for example. Show me the idempotent shell script which does apt-get to install some dependency, updates some configuration file, and then starts or restarts a service depending on both the current state of the service (was it already running?) and whether the apt-get or config file change actuallly modified things.

Then scale that up. A lot.

There is even more. If you care to learn it before dismissing it.