From what people are writing here, there are multiple definitions of "perfectly well". Someone in an above thread complains that capacitive screens require only the lightest touch, ensuring that they make mistakes when trying to use their fingernail to accurately press a specific pixel.
That, to me, says that the N900 and Neo900 do not have "touch" sensitive displays, they require pressure. I'm finding it improbable (and I'm willing to be proven wrong, but I'm increasingly sceptical as this videophilesque discussion continues) that the usual range of gestures we've come to know and, yes, love, are going to work nearly as well on that type of screen.
If I'm wrong and a light tap will always work, and a swipe will never be broken up into multiple gestures or ignored altogether, and so on, then I'd be delighted, albeit surprised the technology isn't being used anywhere else.