I was on Zoom with my mother playing cards recently. She often has trouble with accidentally closing the card game. I don't see how this problem could possibly be improved if it actually were impossible to have the card game open at the same time as Zoom. She would need half a dozen iPads.

(Of course, her solution often is to use a dedicated device for the card game and a dedicated device for Zoom, but this is an expensive solution for something the OS could be designed to handle well, and even if you can afford it it's a mediocre to bad solution.)