Hey, with the exception of those that watch the first few episodes of every show every season (it goes without saying that that's usually going to be a waste of time for the most part), everybody runs across shows that they don't recognize occasionally, and its faster to just ask than to wait around and hope that someone mentions a name sooner or later.
Even if its discussed on /a/ fairly regularly, its possible that the person might be new, might have left /a/ for a while, lurked at the wrong times, or just didn't pay any attention to the earlier threads. Its not like Bamboo Blade is like Haruhi or Gurren Lagann in its prime where there's always 5 or 6 threads active at any given time, and even then, it doesn't hurt to give a source.
Never got why so many people here have a thing against handing out sources. Its not like asking for one is a sign of stupidity.