In terms of "play anywhere". Let's say I have a rig and a laptop. The laptop isn't powerful enough to run RE7 well. However, if Steam can do PC-to-PC streaming, I can at least stream the game to the laptop from the rig.Yeah... I guess so because I never tried.
But the MS PlayAnywhere is not streaming... it is you get two copies of the game for the Win10 Store (PC) and XB1.