Most people prefer the look of forsythia that is allowed to grow in this natural form, as in the photo above.
Plant Form and Texture: Arching Branches
Example of an Arching, Upright Plant Form
If allowed to grow naturally (as opposed to being rigidly pruned), forsythia shrubs exhibit an arching, upright form....
Forsythia exhibits an upright, arching plant form.
David Beaulieu