Thanks for voting and commenting on this issue. Your feedback is key to helping us understand how you use JIRA so we can continue improving your experience. We have reviewed this issue over the last few days.
We've made the decision to close this request, as we do not reasonably expect to implement it in any future iteration of JIRA. Adding another event that triggers an email notification adds more complexity to JIRA's notification system. The existing options for notifying a user about an issue (using the Share button or @mentioning them in a comment) are sufficient in most cases and leverage existing patterns.
I understand that our decision may be disappointing. Please don't hesitate to contact me if you have any questions.
Product Manager, JIRA Platform