Pulse breakages are due to over-tightened feednecks and the use of a certain type of polycarbonate which isnt designed to take shear pressure but very good at taking impact pressure - which in my book makes it mostly user error - not deliberate company rush.
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I don't know about vlocities, but people crack/snap halo and empire necks all the time. You probably don't hear people complaining about it though because halo/empire don't say their shells are unbreakable. When people's supposedly 'unbreakable' shells break then they start complaining.but this hasnt happened with halo/empires/vlocitys, and surley people dont just over tighten there feedneck if they are using a pulse.