Are you Gary Gygax? If not, then I'm not really sure why it would bother you based on your reasoning. I would also note that under the same reasoning the titles Players Handbook, Dungeon Masters Guide, Manual of the Planes, Oriental Adventures, Monster Manual, etc. are also questionable.
The original Unearthed Arcana was a mish mash rules expansion for 1e. That's all people have proposed here. A product similar in scope and thus bearing the same name, in keeping with the 3e book naming conventions set forth by WotC so far (ie reviving 1e book names).