That thinking might be right for some people, but it's very wrong for others.
I would want to know about it, only IF I have Playing Now expanded.
If I don't, it should quietly wait in Playing Now until I go look for it.
Here's the problem:
People have lots of devices in their houses that do DLNA (TV, stereos, etc), and those devices are under the random control of kids, wives, husbands, timers, apps, etc. They can turn on and off at any time. And the person may not even use DLNA from MC.
If Playing Now is Expanded when they turn on and off, then things move in the tree, sometimes right as you try and click on it. Have you ever played whack-a-mole? This is not fun. It is fantastically irritating.
So if I'm working on MC in my den, then No I do not want to know every time someone turns on the TV in the basement. I also don't want to know when then turn it back off 5 minutes later. And then 2 minutes after that when they turn on the one in their bedroom.
If I intentionally go to expand Playing Now and look for it, then I'll see it. But I don't need the tree to move as a notification that this insignificant act has happened, and happened, and happened again.
This is not a fix/change that harms anybody:
If someone likes their tree moving all the time, they can leave Playing Now expanded, and they will get to continue to enjoy the current behavior, no problem.
But for those who don't like things to move right before they try and click it, they should be able to collapse Playing Now, and have it stay permanently collapsed until manually expanded, so that things don't go jumping around every time a device is powered on or off. Everybody's happy.
Make sense?