If it's pouring rain and I plan to go walking in it, then I will prefer a non-breathable poncho over a $500 Goretex jacket if I must choose.

There's a common notion of always using Goretex because "hey it's expensive so it must be the best for all wet conditions". Based on my experience, I don't find that notion to be true.
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If you're reading this, it's too late.