Okay, I can see the distinction between the necessity of a decision and a necessary decision (although I still think of the latter to be the same as the former but I do understand that it can be interperted differently under different contexts), in which case, I can see your point.
However, after having re-read my original post, it became clear to me that the term "arbitrary but necessary" was merely a summation of a definition of a word and it made a good subject title. My mystery word's definition was demonstrated in context yet, you proceeded to ignore this and, instead, concentrated on this literal description and simply declared that "no such word exists!" Because of this, I can't help but think you are being "smart" or "cheeky," rather than honestly trying to help me find this word.
So, let's start this again.
A word that can be used to describe a decision that is arbitrary but must necessarily be made. In point of fact, the "which side of the road to drive on" example is exactly the context with which I had first heard this word.
Any ideas?
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