Dragging a window from one screen to the other or releasing it to close to the edge
Yes you can.
No you can't. It only "works" if you hit the edge of the window with the tip of the cursor.
A cursor looks like this: <-> and you should be able to drag any edge of the window when the _ is over the edge. And not only when either (depending which side you drag) < or > is directly on a 1 pixel thin window border + 2 pixels or something.
A Mac in 1987 wasn't a laptop with multiple displays
Why you refer to laptops is beyond me. I worked with plenty of multi monitor Macs before 1990.
That's on you, because as soon as you unplugged the laptop from the docking station you told Windows "Hey, I don't have a second monitor anymore." and it shuffled everything to the laptop's display so you can use them as soon as you open the machine.
WRONG: the laptop is in sleep mode when I unplug it and later plug it again. Of course the vendor and Windows together mess it up, as they wake up the laptop when it gets unplugged. How retarded that is I can not even express
overlap screens just fine if your screens are the same size
Yeah! Same SIZE, now you get it!!!
aligned to the proper positions, and have the same DPI.
My Mac Laptop and external display have not the same DPI, but work fine. Not so windows.