The traditional windows UI is perfectly capable of accommodating all of your use cases. You want to code full screen? Put your editor into full screen mode and auto-hide all the panels. You want multiple windows? Just drag windows around and resize them to your heart's satisfaction. You want neat tiles? Use the snapping feature that virtually all modern desktop environments provide, or if you're really serious about tiles, use a tiling window manager.

All the alternatives I've seen so far, on the other hand, are excellent at one or two of these use cases but not all of them. So it's understandable that each and every one of them has a sizable group of vocal opponents (though not necessarily the same group of people) whose needs are being ignored.