Windows 1 was hard to work with because they used a strict tiling model for window management. All apps had to fit into a screen grid of non-overlapping tiled w

Windows 1 was hard to work with because they used a strict tiling model for window management. All apps had to fit into a screen grid of non-overlapping tiled windows. You very quickly got to tiles that were too small to be useful and hurt the usefulness of Windows as a product. By Windows 2, they had given up on that tiling model and gone with overlapping windows.