Yes users of the ZCA in game mode is low, that’s because it could be far more useful to the rider. Its currently only being used by probably 10% of riders during their ride. Sure its a very useful tool otherwise, but in game, it could be a whole lot better and then more people would use it. Not being able to use it on a large tablet or iPad in landscape is a major design flaw.
At least the image rotates, try a Samsung a8 tablet or the likes the screen stays on portrait so its 100% unusable.
What Zwift doesn’t realist is you can not tun a decent size iPad or tablet in the device holder in portrait if you have a big screen in front of you because it BLOCKS the bottom of the main screen. I cannot even run one now in landscape anyway as it would still block the main screen, what I did was get one of those monitor arms and have it come up beside the bike screen on the left so its a clear field of view.
My main reason for the Landscape view is to be able to put more useful information. As you can see from your picture 2/3 of the screen is wasted, the middle’s still big enough for the map display you then have an overlay for other ride data that’s on the main screen to be able to move down to the iPad.