Agreed. It's a lot harder to tell when it is your turn in a turn-based game. Having the yellow banner across the top was much easier to see when alt+tabbing through open apps on Windows.
Now I have to focus on the window itself and focus on the tiny icon at the top right which doesn't even change color when there is turn waiting. What's more, when a game is waiting, it's just a number in a circle, which is already part of the icon's design! Basically, the icon doesn't change enough to make it easy to tell when there is a game waiting for you.
Even if it changed color, to like red, when a turn is waiting, would be a huge improvement over the current/new interface.
So if the banner isn't coming back, at least have the icon change color when a turn is waiting. Even better, have it change shape as well.