I think we should leave it up to the user and provide sane defaults. Does the lxc gem (which kitchen-lxc uses) install properly on Windows? I don't think it's worth including these additional dependencies. It's adding unnecessary complexity to the dependency graph. 

Furthermore (and related to vagrant-bundler), we are generally straying away from Gemfiles, as they are generally foreign concepts to non-Ruby developed. IMO, the Gemfile should contain the bare minimum requirements. Additional complexity can easily be added later by power users.