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the part that actually get pushed down by your boot, that little tab... is never metal. Some DIN settings are high where stomping into the binding might be necessary. Look at a little kid for example, they don't have enough body weight to click in, causing them to A) squat down and pull the heel piece up with their hands as they step B) stomp really hard aka Boss In Training.
For grown ups... it is indeed because they are a Boss.