Sometimes you need to cancel export because you made a mistake that you notice or change you need to make. But while you can cancel an export you can only do it for the current composition, and all the following compositions will still try and export. There is also no way of cancelling normal composition exports, so maybe a general way to cancel both normal and animation compositions would be a good thing
Yes, this needs to be improved. Some changes need to be made to the exporting UI to get there though.