There is nothing written in the "laws of the game" either about ducking. According to the letter of the law, when a player ducks his head and gets tackled high, it is prohibited contact and he must receive a free kick.
Same goes for players who lay at the bottom of the pack and get tackled over the shoulder or around the head
You'd be surprised at how much of the game's rules is left open to Gieschen and umpires to interpret. The Laws of the Game run to 75 pages. The section on prohibited contact is only 3 pages
Under these rules, we should probably see at least 70-80 free kicks per game for high tackles
Maybe it is time the AFL pulled their finger out of their arse and rewrote the vague "prohibited contact" rules so they at least bear relevance to how the game is actually umpired these days. They should colour in the details so these rules have at least 10-20 pages of content instead of just 3 pages.
Yep and they have been clear on the interpretation. Gieshan as already spoken on this.
You said:
The point is, it should not be up to the tackler to modify their technique when they're not breaking any rule.
But according to the very rules you have quoted they are.
So I am not sure what the issue is.