I love to use doit.im. But in some cases I use it to track "external" task, like something another person has to do. And from time to time I send this person a task list as reminder by email. Due to this persons are more or less "offliner", mail or whatsapp are the only digital options for sending them a list.

It would be great (and mac like) to have a simple copy&paste function to copy all marked tasks as plain text into the clipboard - just I would do it in all other apps.