Jesus never said the spiritual food would be perfect.
Jesus never said a lot of things.
In fact, there is virtually no symmetry between what Jesus taught and what the GB teaches. Jesus says love your enemies; GB says hate them. Jesus says no one knows when the end will come; GB knew several times last century. Jesus says feed the hungry, house the homeless and visit the prisoner; GB says let Jehovah take care of them. Jesus went out of his way to associate with unrepentant sinners and he did this publicly, while the GB forbids JWs from even waving to such.
So basically, when Jesus says go right, the GB goes left. When he says step back, the GB steps forward. It's such a bizzarro, mirror image pantomime that it can't be due to ignorance. It's as if the GB have a perfect understanding of what Jesus taught and are deliberately going out if their way to teach the opposite.