Aimless,

It sounds like you don't consider wearing either a raincoat or a wind shirt, rather possibly both (depending on scenario). So, they're really separate layers in the same system, not alternates of the same layer. (1)base (2)insulation(s) (3)wind-shell (4)rain-shell versus ...(3)shell-opt-A/shell-opt-B.
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The journey is more important than the destination.