If you are unable to keep yourself from cheating, what's to stop you from editing the save file to circumvent the Ironman restrictions? It's incredibly easy. You could literally just change three numbers and the entire game is different.
As others have pointed out, the inconvenience of editing the save file is far greater than the inconvenience of choosing "Retire->Load".
Wanting an ironman mode is not any more strange than not wanting a big red button in the middle of the screen that says "CLICK TO GET MORE GOLD!". Willpower is not an infinite resource in any human being, even though many prefer to pretend as if that was the case.
Note that the benefit from Ironman is present even if you do manage to play a "No reload" game in EU3, as it removes the negative emotions related to fighting the temptation to reload.
As for dev resources, I can´t really see Ironman taking much in the way of resources compared to the benefit to a significant chunk of players.
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