if you don't have a replacement pin in your backpack when you're in the BC then you're a fool - that goes for steel the same as aluminum. i am 100% sure that sparks will replace that broken one.
but yes, without a doubt - even with that failure the LT system is way more solid than the voile brackets. the voile brackets have so much wiggle and play to them that they end up cutting a notch into the pins, and i'm sure the failure rate is just as high or higher with steel compared to aluminum.
if you were scared about your fat ass breaking a pin i guess you could always use steel pins with the LT bracket, although they say not to. regardless, carry a spare pin is pretty much as basic as carry water.