Ansible has a very, very low barrier to entry. You go from 0 to 100 in a very short time. It makes a lot of sense to use it when you just begin building your infrastructure.

Later on you can run Ansible Tower, deploy Ansible agents everywhere, and basically use Ansible under the same client/server model like all the other tools.

Salt is eerily similar to Ansible, it's just geared towards client/server. Being experienced with Ansible, it was weird at first to use Salt because everything looked familiar, yet slightly different.