Suspension geometry is important to a quality driving vehicle, and instant center is the foundation of any link-type suspension.
Here’s the short story on why the instant center is important:
The instant center dictates how the energy from the axle is transferred into the chassis. If the instant center is off, anything from diminished traction to severe roll-steer can occur.
This short was produced by Pedantic Publishing — Their book, The Air Suspension Design Book dives much deeper into the subject of airbag suspension.