> The "everything is an object" drag-and-drop was absurdly powerful. You're not limited to dragging into a directory, you can equally well "save" a file directly into another application, avoiding the middle step of dumping it onto the disk first.

So true!

For sure I was biased when I left RISC OS in favour of Windows 3.1 early 90s, but it took me years to get used to the clumsy COPY-CUT-PASTE metaphors still dominant today.