I think this mostly boils down to our ever-connected society producing unreasonable expectations of communications. It is a very, very recent phenomena that you can instantly contact whoever whenever you want. Previously, it was common place to be unreachable for most of the day.

Realistically, your kid will survive, and even thrive, if you are not able to contact them for 8 hours a day. There is a downside to this kind of tether. It's a new type of ever-present anxiety, like someone breathing down your neck. Half of raising kids is teaching them what to do. The other half is leaving them alone, so they can learn to be competent adults.

Also you don't need to track your kids to enable school time mode, if you want to lock down their phone during school.

What are you going to do when they go to college? Track them? Monitor them? Make sure they go to classes?

At some point, you just have to trust your kids to do the right thing. It's a part of them learning how to grow up and be independent. It's better to make mistakes the younger you are so you can learn from them when there is less on the line.