I all depends upon the type of photographs you are doing. For nature/wildlife photography, or macro photography, or astrophotography, focus is everything. Remember the uproar when it was discovered that Hubble wasn't in perfect focus 30 or so years ago when it was first sent up?
Hubble was a scientific instrument intended to resolve celestial objects at great distances. Points of light must appear as points to do that. The Hubble mirror error has has absolutely nothing to do with the art of photography discussion.