Given everything that's come up about the use of git submodules, I figured I'd open an issue specifically for discussing them - how we recommend people use them, and all that. See: #782684-3: Establish and codify standard set of git-for-drupal workflows (meta issue) → and #814174: Git / drupal.org integration → , at the very least.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I read the issue summary and comments here and I found nothing that indicated that documentation needed to be changed or added. The issue summary stated that this was opened to discuss git submodules. As that has happened I am closing this issue.