Quote from hoodooman:
Have you ever tried driving forward using *only* your car's rear view mirror?
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Yours is an almost perfect analogy except for the detail that if you drove the same road every day, eventually you could make it work because of the landmarks.
What if it's foggy?
What if it's raining?
What if it's snowing?
What if the road is icey?
What if there's construction?
What if there's a new pothole?
What if you blow a tire?
What if its rush hour and you're stuck in traffic?
What if your wife or kids are screaming in your ear?
What if you haven't slept well the night before?
What if you run out of fuel?
What if you're speeding and lose control?
What if someone crosses the line and slams into you?
What if you have mechanical failure?
What if an animal crosses the road and you swerve out of control?
What if your windshield fogs up and you end up in a ditch?
What if you get pulled over by a cop?
What if a tree falls across the road?
Well, welcome to trading. The road is NEVER the same way every day.