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Its not about the linkage, its about the shaft that comes out of the transmission, tucked behind the primary.I don't remember where I heard it, but someone once said to me that the shift linkage is the first thing you should swap on a new bike. I forget what that joint is called on the stock linkage (Heim I thinks) but if you compare how it works compared to the aftermarket ones it's pretty obvious it is not as sturdy.
I have no choice except to use the heel shifter due to foot drop in my left foot. I can see how using the heel shifter can put more pressure on the linkage than the toe shifter does, which could explain why people have had issues. I will say I have never had linkage issues with my aftermarket linkages and have been using a heel shifter since 2007 when I bought my first ride with one.