It would be a mistake to think that Nirvana is unimportant. It would be easy to think the Magic City served little or no purpose since it was not the final objective and it was only temporary. However we should also consider that without the Magic City the travelers would not have continued on their journey and instead would have turned back. So too with Nirvana, it is integral to our complete practice. The Magic City may not have been the destination but it was an integral part of the journey.
Lecture on the Lotus Sutra