If you are alowed to seal off at the top level then the law is NOT being applied.
If you allow crooked feeds to the scrum then the law is NOT being applied.
If you want to give the side in possession an advantage fine. If you want to make the contest redundant then I'm out.
This ^^^^^
However, I'm willing to haggle over where, when and how the advantages to the attacking team (in possession) are dished out.
If your going to gift scrums to the feeding team then a. don't automatically PK the defending team if the front row goes down, b. allow the defenders to wheel any way they want (not thru 90) to either direct how the attackers play the ball and c. if the attackers drive then force the ball to be played if there is any falter going forward.
At the tackle either a. make the tackled player get the hell out of there (that'll never happen), b. if the defenders get their hands on the ball then let then get it back and don't make them give it up if they get engaged. Defenders will pick their spots to try for the ball on isolated players so give 'em a fair crack at it.
There are some others but you get my drift.