On a side note, ALL chambered attacks will hit before the unlucky guy attacks again.
The terminology people use in this game can be so ambiguous. Obviously I can't deliver a "chambered" swing right after I block, because I just blocked, so I can't be holding a chambered swing. Now, maybe you are talking about "chamber blocks" aka "ripostes", which I seem to only ever pull off accidentally. I could never rely on them as a tactic.
I got no problem with the Agi-ninjas dicing me up with their katanas, because it takes them like 6 swings to kill me, and I can kill them in one. It's just embarrassing being totally helpless like that.
With regard to your footwork comment, rushing in to the ninjas face to induce more bounces is suicide, since my GLB is useless at pointe blank (a long polearm bounces more than a short sword at zero range, regardless of power strike).