Currently, a tag can be deleted from a draft post on mobile by tapping on it. This makes it very easy to accidentally delete a tag. It would be helpful to have a confirmation pop-up when you tap on a tag that said "delete?" or something to that effect—tapping again would delete and tapping away would cancel out. I've definitely accidentally deleted tags before while reviewing a chost before submitting and then not remembering what the tag was.
Taylor Currey