The open windows don't even have visible taskbar buttons in the fancy presentation it shows at the top I have no idea how you can productively work that way The reason for getting 4K monitors is not to have less stuff that can make you productive visible KDE 3.5 was the top of OSS desktops, in my opinion
I think I'm missing something... Where is the taskbar? Do you need that "overview" animation each time you want to bring an application to focus? And where are the menus of the focused application?
I prefer a taskbar at the bottom with one button per window in it, so that I can have an overview of which windows are open, which document each has, and quickly switch to it with mouse (when not using alt+tab to switch between recent windows).
What I do not want is to have to activate something, or have some animation, first, before seeing what I want to navigate to.