I agree. It's a bit ridiculous to me that the staff have repetitively said it would be added and made more clear, but nothing changes.
It's been well over a year since they made it a 'rule'.
If what they say is true, "it would take a lot of time and effort to remove it", then they should start working on it. They have people getting paid to do this stuff.
Hitting off the ladders has an easy solution that could have done a long while ago. Move the area allowed for pvp 1 block inwards, so when you're on the ladders you can't be hit off.