Task management apps like Asana probably let you do stuff like this. Email is just for messaging. Nothing is stopping people attaching a to-do item as a file

Task management apps like Asana probably let you do stuff like this. Email is just for messaging. Nothing is stopping people attaching a to-do item as a file that gets opened in some to-do app, just like attaching vcards or calendar items. Its just that very low percentage of emails actually map to some associated to-do item. And in most cases you really just want to set up a reminder.