It's both a glorified todo list and bona fide project management software. For examples, it handles in-app notifications around the task lifecycle, task hierarc

It's both a glorified todo list and bona fide project management software. For examples, it handles in-app notifications around the task lifecycle, task hierarchies, a calendar, a "team" abstraction, and an abstraction it calls "projects" which I believe can be configured to a custom business workflow. In our 6 person org, it has indeed replaced email (we have Slack of course, too).