I’m not really sure what you’re getting at. Are you saying it’s no longer necessary for halves to have a good decision making skills as long as they stick to a pre-rehearsed “simple” game plan? Are you saying Cooper Cronk didn’t have to make big decisions during games because the Storm game plan was so simple?
I'm saying that in the modern game there are more important traits than 'organising' and if a half doesn't make it in first grade it's not because he is poor at game management. Likewise a team without quality game managers can focus on its other strengths and still win the competition.
Regardless of what you’re getting at I think you need at least one half who has a good kicking and passing game for things like controlling field position, getting repeat sets, getting their team mates running the right lines (i.e organising) and can also set up tries through their kicking and passing games by creating line breaks and tries as you say (i.e playmaking). You need both. Milford and Nikorima both seem to be primarily running players who don’t have the skill set to be organisers/playmakers. My point of contention with you is that you seem to be suggesting that skill isn’t necessary if you follow a certain “simple” gameplan. That’s just wrong.
On the contrary, the simpler your game plan the more skill your playmakers need, because they will be the ones you rely on to create tries and linebreaks on those rare opportunities where the defence has made a mistake. More complex game plans aim to give the defence more opportunities to make mistakes but the flip side is that you need players able to spot those opportunities in advance and then capitalise on them by making the right decision.
So I think we're talking about two different skills yet you're calling them the same thing. I see it like this:
Playmaking: the ability to threaten the defence and create a try or linebreak for your supports, via running, passing and/or kicking
Organising: the ability to 'outwit' the defence by forcing them to concentrate in one part of the field and then sending the ball to where the attack has the advantage
I believe the former skill is more important in the modern game, as proven by the way teams are recruited and selected. Getting too clever with 'organising' can just lead to confusing your own team mates while the defence stays in control of the ruck, buying time to continue getting their numbers right. This is why control of the ruck has become the main goal of nearly every tackle - because if the defence can force a slow play-the-ball then 'organising' becomes worthless, and likewise, if the attack can generate a quick play-the-ball then you only need to get the ball into the hands of a good playmaker (like Cronk).
I will caveat this by saying that organising is still a useful skill (and why halves are all still taught it and practice it) because the ability to send the ball where the defence is weakest can lead to the most frequent quick play-the-balls. This is why the key to a strong defence is hard working middle forwards, not a bunch of fat Junior Paulos. With toiling middle forwards like Mannah and Alvaro you are more likely to get numbers into any given tackle across the field, giving up fewer quick play-the-balls.