I understand that it is often not the desired output, but it is sometimes still what is expected.
For instance, in this example, I want to add a minimal wall (grey) between the two water spots (blue).
Keeping the straight line would leave a hole in the wall.
Therefore, it is important to always join the two end points after dragging the mouse (even if sometimes we are slightly off).
They implemented the toggle setting for the new way point system, so I assume it would be the same here.
I agree that it is not needed (it was not even there in the initial post). Both options (including the L-shapes or not) are fine for me.