I agree the conversion from page numbers to word counts is much the same as metric to imperial. There’s no real good reason not to convert, we simply don’t because we’re all accustom to the system we use.
Of course going by word count has the benefit of not being subject to the medium. I’m sure there are drawbacks such as longer works getting unwieldy in terms of the numbers. But that can be worked around.
Not that I want to get into the debate over systems used to measure progress in ebooks again.
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