I was going to post a comment like this if I couldn't find one! As a DevOps-type engineer who writes mostly internal tooling - I really couldn't relate to any of the 3 camps that the author mentioned, but I can relate to what you wrote. Tooling for developers and opearations / SRE types in general all follow a similar paradigm to what you mentioned.

I'd add to add: Fav languages: Whatever is already installed and easy to deploy and maintain/debug on your target system. For linux systems, this might mean Python, Bash, Go.

Additional Hangouts: Forums about AWS/GCP/Azure tooling, Hashicorp projects, Config Management Software projects (ie, ansible)