A longer runway would allow higher derates for takeoff therefore less noise, so it makes sense in most respects. You can lift a surprising amount off shorter runways if you have to but it increases the maintenance costs and noise footprint.
If you’re going to have a runway, making it 1000m longer if you have the space and budget is a bit of a no-brainer. It also allows more in the way of ‘land after’ clearances and LVPs for big/heavy aircraft.