There are loads of reasons its useful for parents to communicate which have no bearing whatsoever on the long term psychological health of the child. I feel you might be reading a little too much into the implications of having that channel that simply aren't founded.

Like: My son loses his sun hat. I could make a point about personal responsibility and let him get sunburnt for a few weeks until he saves up his non-existent pocket money to pay for a replacement, or I could just ask if anyone has it and find out that Joe accidentally took it home and that Joe's mum is going to leave it on the fence post at drop-off.