Here's another way to see it. This from me with no experience shooting pahyderms!!

A huge amount of time, labor, energy and $$$$, not to mention hype went in to the development of this here Big'Un.

If it doesn't perform vastly, noticeably, repeatably and dramatically better than the garden run .416, .458 or .505 then it seems to me it was an exercise in fantasy gunsmithing, along the lines of some of the 17th Century Baroque artists' embellished court pieces of yesteryear or at the other end of the spectrum the fantastical and more-or-less useless display knives a fellow sees at flea markets and swap-meets. Granted, the .700 is the modern Rich Guy's version of both, naturally...

Still amazing accomplishments of skill and concept, but the argument that the gun accomplishes anything other calibers don't already provide seems stretched.