I would like this also! To-Do lets me plan across calendars and adjust my day from multiple lists with differing priorities. Triggering a flow from To-Do would be so very helpful.
Yes, I would certainly NOT consider this completed in any way. It is in there, but at the bear minimum! You can hardly do more than create simple item AND NO triggers. No, attachments, no control of existing items. If this is supposed to be MS primer task tracking system, this is a major oversight....