Vines were grown for the quality and flavour of their grapes. Of course much interest was given over to wine making - nourishing and beautifying life!
The metaphor to convey, the purpose and meaning Israel was the Vine - a staple for living well. Living Well meant covenant relationship with God, to be a blessing to all - Righteousness and an inspiration to which all people would be drawn - Justice. The same metaphor Jesus uses to inspire His followers.