Why Shuttling MTB Trails can be controversial

Today, the trail gods exact their revenge on us for shuttling. Most of us have shuttled before, but new riders may not even realize that it's sometimes discouraged. I thought a lighthearted approach to the topic would be a good way to start a discussion. Where is it okay? When is it okay? Is it ever okay? Duke it out below!
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We'll be riding the trail in this video on my guided trip in November! There are still a couple of beds left:

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