I mentioned the "dev time" as the actual reason why it isn't there before.
It's just no reason why it should not be there.
Don't get me wrong people, I would not go as far as to demand that the devs implement it, I'm just saying that it would be a good thing to have some kind of notification for it (and my personal preference is the glowing button, though even I don't invest my time to find/create an addon that does it for me.)