Hmm, for urgency I would use some sort of clock as a symbol to indicate the temporal dimension. For the nice to have the fact that is "optional". So there has to be an element of choice. A road that forks off in two directions would be one way to express it. But there needs to be another element that distinguishes between the essential and the merely desirable.
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Hmm, for urgency I would use some sort of clock as a symbol to indicate the temporal dimension. For the nice to have the fact that is "optional". So there has to be an element of choice. A road that forks off in two directions would be one way to express it. But there needs to be another element that distinguishes between the essential and the merely desirable.