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Excellent question actually..and I don't really have an answer. For me, I just looked at the number of times that I have had line snagged in bolt snap thumb slides (zero) and the number of bolt snaps I carry on me that I can't easily reach and clear should line get entangled in them (zero) and decided not to mess with it.If the bolt snap thumb slides are a possible line snag/hazard of significance, why isn't grinding them down "standard".
As someone newly exposed to the DIR philosophy/method/mindset, it seems stange to me that some practices are gospel to some, but laughed at by others.