"Not really."
Actually, yes it is...
It's is, by far, the messiest powder I've ever used, and I've used most of the old-time flake powders, and yet it has the unique (there's that word again) to mesmerize so damned many people into thinking it's the best thing since sliced hammers...
I've not looked into it for many, many years, but when I did so back in the 1980s I recall finding that, of any powder then in production, Unique had, by far, the broadest range of applications of any singe powder, and in many of those cartridges had a wider application band than more modern powders that were more "suitable" for that cartridge.
You can brand the living hell out of something, but if people find that it's not going to serve their needs and match up to the hype, it's going to be abandoned. The world is full of products like that... New Coke, Clear Pepsi, Congress...