What is the point of the Mr, Mrs, Lord and Lady? Very few people other than lawyers appreciate these niceties. Nor is there any reason why they should. They are neither logical nor necessary.
If, centuries ago, there was a valid reason for adding these appendages, it has long disappeared.
But just because something is only historical, neither currently logical nor necessary, isn\’t actually a reason to change it. We could call Black Rod the Head of Security for The Commons if we liked, wouldn\’t change all that much except losing us a little part of our rich and varied history. A loss of something for nho very good or great purpose.