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If you've only got one device, say, a Kobo Touch, and you have set it up to always use one set of formatting options (i.e. font size, margins, etc) and only plan on reading on that, then I can understand why you feel a single page should be represented by the text on one screen only as it will never be different.
Unfortunately there are a lot of people - myself included - that will read a book on multiple different devices. I myself use a Sony T1, Samsung Galaxy Tab, HTC Desire HD and an Acer Aspire 1825PT laptop as my main reading devices, I don't carry them all with me, but I generally will have one of them around to do my reading on. They all have different screen sizes and resolutions, so there is no way I could use a numbering screen as you can because they will almost never be able to represent the same page for a given page number.
The ADE method of page numbering means that I can always find my page when changing devices because I know that ADE sets a page to be a 1000 characters. Therefore screen size or resolution is irrelavent.
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