We have completed the checklist feature as a solution for this.
Here is a related thread if you’d like to support or follow the suggestion for assigning checklist items: https://planner.uservoice.com/forums/330525-microsoft-planner-feedback-forum/suggestions/14924745-assign-checklist-item-to-specific-individuals
An error occurred while saving the commentAnonymous commented
Checklists are not sub tasks. Think of this request for "sub tasks" in Agile as Epics, Features and tasks. When might we expect this capability?