Actually, most of the plans were hinges on JL's winning. In Comic terms, the plan would have 100% rate of excecution. And the plans that had the largest impact were stall/diversion tactics.
It's as if they KNEW they were in a play. A play where they'll never win, but the rules never states they can't prolong that inevitable day arriving.
So, instead they plan to make plans, to expand, to stall. And even in the face of mutual defeat, have total faith in the heroe's ability to WIN. Take a small example, Mongul wouldn't be defeated, if only he were to left his seat just to swat Superboy at that very moment. It could totally happened, but it won't. That's just one example of going wrong.
YJ is the first time I've ever seen villains who didn't plan to win outright. Because I suspect they knew they can't.
The fact they willingly sunk all of their resources into the plans, because they knew it'll be a war, not a series of battle.
Even after they have won, they still don't believe they had. It's a pretty large inferiority complex they've got.
The trouble is, erasing egos to this extent, they act more like HYDRAs, than a bunch of super villains. A feat I find pretty hard to swallow. They didn't just say 'I'll give you X, A, B. And You'll give me F, B, J. Each of us will contribute some to this plan. Their contribution rate is closer to 100% to the total plan. Where no self respecting super villain will do. And certainly not in this long a run.
Superb plot, impossible execution. Or make that 100% execution after adjusting for the 'Heroes will always win' rule. Which ever way you look at it, it's weird.
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Don't get me started on the how Luthor wanting the best for humanity. With the amount of Alien/Futuristic tech at his disposal. Old tech(Crap guns/Fossil fuel vehicles/etc) are still in use everywhere you see. That's one area where we'll never see improvement. Comic writers are set in their ways of using current settings. Nevermind that said settings will never survive alien contact.