For window move I think it's a reaction to the popularization of putting UI in the window titlebar so there's nothing to grab onto. I don't mind it but I wish there was a dedicated "grab" button on the mouse because I find it clunky to have to use both hands to manage windows.

I can tell you the feature of Meta/Super¹+L/R click to move/resize windows has existed on Linux long before UI in the window titlebar became a thing.

¹ aka Windows key