I had an idea a couple of days ago. Based on the spfx project upgrade command, why not building a spfx project externalize command?
The idea is that it'd be based on detection rules, scan the package.json (and maybe some source files) to detect packages that could be externalized and suggest a config.json external configuration.
This way a developer could be sure he has the proper configuration, didn't miss out any package and so on.
Thoughts?