Ah man, I'm with a project that already uses a poly repo setup and am starting an integration repo using submodules to coordinate the Dev environment and unify with CI/CD. Sub modules have been great for introspection and and versioning, rather than relying on some opaque configuration file to check out all the different poly repos at build time. I can click the the sub module links on GitHub and redirect right to the reference commit, while many IDEs can also already associate the respective git tag for each sub module when opening from the super project.

I was kind of bummed to hear that working trees didn't have full support with some modules. I haven't used working trees with this super project yet, but what did you find about its incompatibility with some modules? Are there certain porcelain commands just not supported, or certain behaviors don't work as expected? Have you tried the global git config to enable recursive over sub modules by default?