As a shape changes size, the “thickness” of the boarder needs to size up and down relative to the shape itself, then, when moving the slider on the border the size changes relative to the size of the shape, not relative to the zoom of the board.
It’s correcting a wrong - the shape and the border will both be relative to the size of the shape.
Currently - the size of the border is relative to the zoom of the board, the size of the shape is its own element.

