It serves a purpose, aye its not the most beautiful part of a bike...
Im innocently asking why there is so much loathing of a useful small bit of plastic, I honestly don't understand the hated here guys please educate a naive idiot without taking the piss (too harshly )
I done personally like the look of them and on the rare occasion a bike or wheels has one attached, it gets removed.
They do serve a purpose and there is one set of wheels I run one on, Mavic crossmax. The fat spokes are quite expensive to replace and the Mavic dork disc isn't an ugly bit of clear plastic that discolours and looks ugly quickly, but a black plastic spoked thing that doesn't look bad and is barely visible.
So in conclusion, ugly but functional.
I suspect the reality is they are removed to save weight
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Because the purpose they serve is only relevant if you've failed to set your derailleur correctly.
Because they normally fail at their purpose the first time they are asked to serve it.