I assume there is some tradeoff with some kind of out of control stuff / abuse that happens by some minority people that cuts in if this is not managed.
I feel like organisations should be leaving that to line management rather than controlling it through blunt policies, but I can see how from the top level there is a perception they need to enforce stuff like this. The real problem is that the abuse can often be measured and quantified while the cost of inconvenience or chilling effect on activity can't be, so I always think the costs likely are not weighted appropriately in whatever assessment is done.