Agreed on your second paragraph. Tiling as a model is, imo, better for the general case than overlapping for all levels of users (and you can see the move by both MS and Apple towards full-screen windows as a really naive step towards that ideal), not just power users. I use i3 and I love it, but its mouse-phobia drives me nuts sometimes. I'd really like to be able to hold down Super and just frickin' drag a pane/container/workspace to the place I want it to be with the mouse. That's the sort of thing it's meant for.