It's easy to swipe and delete a list, which you might've spent hours making. If you mess up (you could drop your phone, for instance) and don't undo it in time, the list is gone forever. There should be a recycle bin where you can restore any deleted lists. Though, I'm not a fan of recycle bins in apps to be honest, so a confirmation dialog could be more intuitive.
It's easy to swipe and delete a list, which you might've spent hours making. If you mess up (you could drop your phone, for instance) and don't undo it in time, the list is gone forever. There should be a recycle bin where you can restore any deleted lists. Though, I'm not a fan of recycle bins in apps to be honest, so a confirmation dialog could be more intuitive.