I think it's a good idea for chronically late parents. A relative of mine works at an elementary school and some of the parents are over an hour late picking up their children. She has to stay at the school until everyone is gone so this is very inconvenient to her. She told me that often when she calls parents they don't apologize for being tardy and occasionally ask if she can drop the child home (against the school's rules).
These days not picking up your child can become a safety issue. Children hanging around a school unsupervised are a target for perverts and weirdoes.
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