You have provided your own answer, as you intended. There are 155 pages of 500mm PF images in just one Fredmiranda thread alone! https://www.fredmiranda.com/forum/topic/1549025Being backordered only tells you that demand outstrips supply. Nikon could have produced just 2 of those lenses and have 5 on backorder. Judging from social media, there are a lot more in the field than just 2, though
If only Canon would make such a lens. I love my 400mm DO II but I can't hold it up pointing into the air for long, and I strained my shoulder hiking with it on a long holiday and now use a double sling across my chest. Those who don't go out on bird watching hikes might not appreciate the importance of light telephotos. But, there is a huge market of those who do.
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