If a question is low quality then high rep. users have the option to close it, and then later the option to delete it. This has a built-in safeguard, in the sense that if the question is closed but then edited it is placed in a review queue and may then be re-opened as a result. Great.
So what happens to low quality answers. High rep. users can only vote to delete these; there is no concept of a "put on-hold" answer.
Is a deleted answer "lost" even when it is edited and improved, or is there a automated system in place, similar to that for low-quality questions but which is only available to 20k users?
[I understand that the editor/answerer can appeal on meta in the appropriate thread. But this is not automated.]
(My motivation for asking this question is: I recently saw a poorly-formatted answer up for deletion in the review queue, and someone had commented about MathJaX. However, the answer was posted 30 mins earlier and the user had not been seen since (which is not unreasonable!). Therefore, they have had no chance to respond to the comment by editing and improving their answer. What would happen if I voted to delete?)