I’m aware of it. I cannot say it is something I have looked into.
DXGI_PRESENT_TEST is used on Swap Chain presentation if you want to check for DXGI idle state. It is not terribly important in the case where the application is “iconic” (minimized to the taskbar), it is mostly for non-game software that should continue drawing stuff even as a user is working in different applications. For those scenarios, DXGI_PRESENT_TEST identifies when a window is completely occluded and the app is free to go idle.
Software in the “iconic” state should already be in its idle state, running the game loop and presenting the swapchain when software is minimized is just plain stupid. I don’t think I’ve seen any games that do that