I agree with BobRock's comments (cool username BTW).
Competitive/contested scrummaging added another dimension of competition to the game of Rugby League, and made the game more varied and less one-dimensional. Not only that, but the physical demands of scrummaging on the upper body created increased size and different shape for forwards, especially frontrowers i.e. created a difference between forwards and backs. According to neurological and spinal surgeon Dr Robert Bray
(at 2:18), a contested scrum can generate up to 1.5 tonnes of Force.
The elimination of the scrum contest removed the need for that upper body bulk. it meant that front and backrowers could slim down to become more athletic and thus focus solely on ball carrying and getting around the field. As a result, there isn't much difference in size and shape between forwards and three quarters. Therefore, little playmakers struggled to unlock defensive lines through passing and playmaking skill, and rulemakers have continually tinkered with ruck/play the ball speed and interchange which ultimately hasn't addressed it. The game can be based on the speed of the carry, the speed of play-the-balls, and exploiting a backpedalling defence rather than unlocking it.
Contested scrums in RL would not have to be like messily packed, ill disciplined 70s/80s scrums. RL forwards could be more mobile than some of larger, bulkier Union props or locks. Some Union forwards are still dynamic ball carriers, like Wallaby prop Benn Robinson
(1:19, hooker Tatafu Polota Nau
(from 1:50, his runs are shown), Springbok loosehead Beast Mtawarira
(0:17, 43m line break), hooker Bismarck Du Plessis, number 8 backrowers Pierre Spies
(from 1:50, 70m try) and Ryan Kankowski
Contesting scrums also won't necessarily mean higher penalty counts. Last year, RL's 3N Kangaroos Kiwis test
yielded 20 penalties. The Wallabies All Blacks match in Tokyo
yielded 23 penalties, a mere 3 more (plus 3 short arm penalties). Scrum infringements in RL could be dealt with by a differential penalty (IIRC NZ referee Dave Pakieto gave one in an Kangaroos GB test in the Tri Nations 1999 in Brisbane), as SANZAR Rugby Union tried in the Experimental Law Variations of 2007-2008 with short arm penalties for most offences.
When it comes to ball time in play, the number of sets of six, and the number of tries scored in a match, quantity doesn't necessarily equal quality.
I actually preferred watching RL when we had competitive scrums