Many people could do that but many of us live within walking distance of the school and our children are much too old to want Mom or Dad tagging along the block or two to school. Even once you child is on the school yard there is no guarantee they are safe. A couple years ago a girl was abducted from the school yard in the next city and was found dead 3 months later. I'm sure bus drivers aren't walking each child directly to their classrooms either. I'm not saying a school needs to be doing a parents job for them but if a child isn't where they're supposed to be it's nice to hear about it before it's been several hours.
It would be nice, but like I said it should not be necessary for the school to notify the parent. If a parent is worried that their child isn't going to make it into the school safely, then they should do what it takes to make sure they know their kid made it to school. That includes doing things that the kids may not like. We shouldn't rely on the school to keep us from worrying.
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