We don't know enough about the automatic weather grid in the future to say it makes watering obsolete. It may not function perfectly, or it's effects may be limited to massive areas this necessitating watering if their zone is scheduled for constant summer sunshine to appease the housing estate 3 miles away.
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From what I read, you dont need to irrigate your vineyards at all, except for droughts or unsuitable lands.
Anyway, its just for the "future" effect.