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Yeah I never quite got it. Although I never do anything where I'm driving massive fixings all day. I have noticed that massive 12 or 14 gauge screws will tend to explode a non-impact rated PZ3 bit fairly quickly, but I can almost count on one hand the amount of times I've done that in the last decade. For heavy duty stuff I imagine not having to change bits all the time would be helpful, but you can get a multi pack of Wera bits for about £8-9 for 30 bits, so 30p a piece, works for me.
Apparently the Wera ones have impact rated bits but like you they are a throw away piece and at the price the wera ones are they defo aren't throw away.