I agree with the 1/4 or 1/2 pedal... Chopin's piano was not as resonant as the one's today. But also, articulation does come through the pedal, assuming the pedal is fairly clean. With staccato comes a certain attack, and maybe that is what composers want in general with a pedal/staccato. I'm not specifically referring to that Chopin etude, just what I think in general.