All I know is that I've seen about 4-5 old bindlings explode when stepping in and closing them. I've seen zero fail when stepping out opening them. Seems to me that closed puts more stress on them than open does based on that anecdotal evidence.
When stepping in, your boot loads the spring and you have forward pressure that is what causes any weak plastic heels to explode. But if you close a binding with out the boot it should not create much pressure on the heel.
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