What do you think about also using the following plugin: https://github.com/autonomousapps/dependency-analysis-gradle-plugin?
It reports unused plugins/dependencies, and warn if the wrong configuration is used (for example, api vs implementation).

Edit: I've created a PR with the plugin mentioned initially. I'll create a dedicated one for the Dependency Analysis Plugin if you want to include that one too.

Unused implement is fine to keep until we find them. Current issue that I want to resolve is guard some important issues to avoid it is updated by other look-like-safe dependency updating, for example guarding guava version.