The rule should be changed to a penalty in the first two tackles then six again after that. Six again on tackle 1 & 2 only advantages the defending side.
The rule should be, if 6 again is awarded to a team & the other team deliberately holds down on the the next tackle, there should be a sinbin. That'll stop deliberate holding down on that ruck for the defence to get set. Happens league wide. Even the Tigers have been guilty of it. But today, the Titans constantly did it. Referees are too gutless to send someone off cause they'll be criticized afterwards. But they are getting criticized now, so, in for a penny, in for a pound, and do what's fair.