People resist the idea that God would limit Himself in that way, or stoop to our level. They reject God's descent to earth, that He became a particular man in a particular place, in a particular time. That God should choose one time, place and group over any other strikes them as unfair, undemocratic. They resent the fact that they cannot do as they please with the liturgy. The liturgy could easily be misunderstood.
Important points are essential features, essential form, inward essence and preexisting identity.
The spirit of the liturgy is not one thing today and another thing tomorrow. To have true reform of the liturgy, we must first respect the form of the liturgy. Modern man is accustomed to manipulate, control and dominate the world, the suggestion that there exists a definite, objective meaning to the liturgy scandalized him. He resists the spirit of the liturgy and would rather dominate the liturgy to make it fit his own whims and desires. This view displays an attitude of rebellion and an unwillingness to receive the true worship that Christ gives us.