Agreed. I wouldn't say any of these astute points argue against commitment devices (as it sounds like you're implying but I could be misreading you).
A commitment device provides an incentive, including the incentive to eliminate distractions by going somewhere quiet or whatever else you need to do to follow through on what you've committed to.
A commitment device provides an incentive, including the incentive to eliminate distractions by going somewhere quiet or whatever else you need to do to follow through on what you've committed to.