Huh? Since I switched to using tiling window managers, I actually prefer multi-window interfaces for the first time ever because, to me, when tiled they essentially work like single window interfaces, except I have a lot more control over it.
(I use a manual-tiling WM, not an automatic-tiling one - I wonder if that makes a difference in this case)
awesome is also dynamic tiling, while I use a WM that does manual tiling (though I can make it dynamically tile by window class, application and other parameters - though I have to write scripts to do it - its not automatic out of the box) and maybe this is the difference: I can lay the windows out precisely how I want, while if I understand dynamic tiling WMs correctly, they will try tile the windows for you, which may not work well for multi-window interfaces.
(I use a manual-tiling WM, not an automatic-tiling one - I wonder if that makes a difference in this case)