This is absolutely essential for planner to be a viable task management system for orgs that heavily utilise event driven workflows.
We have specific work tasks that are triggered based off external business logic, therefore we need our integrated 'applications' to orchestrate the creation and assignation of Planner tasks. We can't do this cleanly with delegated permissions.
Because of this we are stuck with SharePoint Online lists. Whilst this is an ok solution and is getting 60% of the job done, there are so many missing integrations between Graph and SharePoint Online which limits our effectivness and user experience.
Want to include some attachments on a SharePoint list item? Well sorry, you can't with Graph. It simply doesn't support attachments at this time...
Ok I have an alternative! What about we store the attachements seperately and utilise a Hyperlink column to provide an easy way for users to access their task related data! Sorry no....Graph doesn't currently support Hyperlinks data types for list items.
Microsoft, please implement this feature request. The improvement it would bring will almost instantly improve our M365 task management experience. You would make a lot of us happy.