Only tangentially related, but I'm always fascinated that mailing lists are still a thing in 2025.
replies(3):
• Non-proprietary
• Federated
• Archivable
• Accessible
• Not dependent on a specific company
And having a built-in issue tracker
1. isn't related to those properties, and
2. isn't truly within the scope of a source code version control management solution.
That's the domain of project management.