True. But it matters not what that appearance was. It is not important. Those who would deny things based on an appearance or a lack of one are no more likely to understand the importance of his being a real person, in a real place, in a real time than those who deem it important.
Faith is not revealed by vision, rather vision can only confirm faith.
I'm not sure I entirely agree with that, either, the more I think about this. As I said in another post, He was Jewish, not Chinese; a man, not a woman. Just from those two points, both in Scripture, some "appearances" are not possible.