they announced that with the Note 4 actually since that phone supported Facebook messenger style floating windows for as many apps as you wanted. Android nouga

they announced that with the Note 4 actually since that phone supported Facebook messenger style floating windows for as many apps as you wanted. Android nougat added that to the AOSP source so any android phone can open up to 8 apps at once in floating windows. This is not new tech. The 3 way app view is just a tiling window manager managing it in a weird way it's not a real restriction