When people push updated patches to MozReview because the old patches were backed out, their request would be aborted. In that case, people would need to open the page and reopen the request, then push again, which is troublesome. I think people usually have good reasons to push to a closed review request. It is probably better to allow people to reopen review request from push command directly. It can have all the warning message it has currently, and also defaults to not reopening. If bug 1312077 can be fixed, this is probably less necessary.