The sentence means: They could be tapered slightly, I suppose, but they needn't be. I am in the UK ATM. I can appreciate the taper comment--even if I disagree--but the subjective opinion about chinos over shorts is a subjective opinion about chinos over shorts. Why not come out and say: 'I don't like shorts'? I think the rolled chino look can be used well, but I prefer, to avoid it myself.