people also use email as a support ticket system. Sprint planning system. Kanban system. I’ve seen it set up so that it can track work across kanban teams and scrum teams.

Email has deep integration with bitbucket, confluence, and GitHub.

Email can manage your CI pipelines as well.

Email is an anything app with a bend towards project management. Setting up email workflows is a whole career.

Source: I worked at Google for years and they use email as the backbone for _everything_. It all flows into email