We usually deploy kartotherian to a single data center at a time: eqiad or codfw. Because of this, we hadn't noticed that some of the scap-templated configuration doesn't work correctly when deploying without the --env flag. For example, tegola_uri will be rendered without content. This prevents server startup.
Either the deployment to both DCs should work correctly, or perhaps there should be logic in scap which stops us from doing something so rash?