✔ 最佳答案
Some say that, like nearly every other feature here, it was being badly abused. I'm not sure that's the reason because it could be turned off (no one had to allow others to email or message them (back when Messenger existed)). Either way, for whatever reason, it was deactivated well over a year ago and we have no expectation of getting it back. People now use answers or comments to abuse/attack each other, instead of via private email/Messenger (it's rather pathetic).