Good point, but the kid is heavy enough to matter. My folding stroller has locks in front wheel for rough terrains, but problem with using it that way in stores is that 1) I had to have some space to lift (not comfortable when my back was against the store shelf) and 2) 2 actions (lift and pivot) instead of simply turning. It made lots of difference, at least in my case in trips to densely populated areas. And with kids in tow, every second counts 
[edit: grammar]
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