Yeah but that's cliche' and therefore boring, and therefore wrong.
Besides, keep in mind that the Blades are a secretive and elite order. Walking around in shiny metal armor that's gonna attract a lot of attention isn't exactly their style. In fact ninety percent of the time they're in disguise as normal civilians, gathering intelligence on potential enemies of the Emperor.
Well yeah.
In my eyes it would still look awesome though.
I can see at least the Personal bodyguards of the emperor wear something like that.
Nothing wrong with samurai-esque armor though, but if they where aiming for that, it could have been so much better than what we have.