I agree with the sentiment entirely . . . but the item in question does say "They do so by using an appropriate theme". It does seem like they're divorcing it from the class itself, which is good. If archer or tempest is a theme, and you can still build a ranger who's a lurker or a slayer or whatever, then that's perfect.
It also says "Many Rangers focus on a particular combat style." So I assume some don't. There's probably going to be other themes besides these two combat styles, like a Chris Hemsworth Huntsman twirling around all manner of axes, or even a more mystical ranger theme that allows minor spell casting as an option for the class.