Well, you might irritate fans of the original who buy your ebook to get back the book they loved.

If I suddenly saw some book that thrilled me a decade ago for Kindle, I might snag it fast on impulse to re-read. If it had substantial changes from what I remembered, I might be a little put out.
Of course, you could always publish it as the "revised edition". You could even include the original with the book too. This is digital publishing, after all - you're not paying for pages printed! So you could revise, have the revised version be the main, and include the original inside as well, maybe with a couple thousand word essay on why you did the revision and what you felt needed changing.
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I can think of a couple of OOP books that I would like to see available again, and I would really be annoyed if the writer had been messing with my memories. And there's no way to tell what parts of your work are memorable for others.
On the other hand, I'd be interested in the old/new versions to see how the story might have gone, especially with an essay on what you changed and why. Sort of like a 'Director's Cut' as an extra on a DVD.