Hi,
I think the "idle" time, of an "open" connection offers more issues and problems in terms of security, this closing them down some makes sense.
On the other hand, it's also an issue with the modern way of life ... make everything shorter, including people's attention spans!
Sorry ... just another idea of mine for people that are just looking to trap you into the "establishment" society! You have no say or feelings or anything that will help them change for the better and more educated side of things which include all of us.
As I like to say ... "we're not all monkeys on this bus!"