Taps 20: Vented tap

This one I found in the office kitchen. I have 2 issues with it?

1. Why the spout is not longer so when the water flow is low it drips all over the counter

2. Why would someone want a dripping tap? I understand that the vented tap releases the pressure from water heater when the hot water expands - hence the dripping. So my next question: why not using a different heater? I had lived in houses with water heaters and non of the taps ever dripped. If it would, I wouldn't be able to sleep :).