Message deletion hierarchy

So as a server owner, I'd like Discord to implement a hierarchy for deleting messages. There's a hierarchy for assigning roles (Like a moderator cannot add a higher role to themselves than the one they already have), so why is there no limit to the messages a moderator is able to delete. 

I have moderators that can delete my own messages as owner and there's no way for me to turn this off unless I change the setting in a specific channel for them to not be able to delete messages (which ultimately ruins the point of them being able to delete messages.)

I'd love if Discord could implement the message hierarchy and make it so that lower roled users are not allowed to delete messages of any user/bot that has a role stated higher on the role list!