@mayintoronto @lcamtuf presumably mostly because it doesn't make any sense?
Why do I need to be told a is not equal to b when I already know it's greater than b? It's definitionally not the same as b! If being the same was an option ≥ would have been used.
At least greater-equal-or-less doesn't seem to violate any rules as I understand them, appears to be utterly pointless but…