I think it does. I believe that the main reason is that it's uncomfortable when you scroll down.

Is there a way to keep the same margins in even and odd pages?

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    You can always set the left and right margins to the same width: \usepackage[left=2cm, right=2cm]{geometry} – DG' Nov 5 '18 at 13:37
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    If you want to scroll down a 2-sided document, then view the left and right pages together. If you don't want to do that, don't create a 2-sided document. The reason the margins are not symmetrical for a 2-sided book is because if they were symmetrical, the central margin of the physical book would be twice as wide as the outer margins which would look wrong. – alephzero Nov 5 '18 at 13:37
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    You can set [oneside] as a document class option, then remove it when you are ready to print. Note, this also gets rid of the extra blank pages. – John Kormylo Nov 5 '18 at 13:49
  • @DG That's a good idea, to me. I'm not sure, though, if it should be 2cm or 3cm or whatever. I think I'll just try to adjust to ~80 characters per line. – Francisco Nov 5 '18 at 16:44
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    BTW, the title "Does it look ugly" is subjective and not a good fit for TeX.SE. The question in the body "how to have the same margins" is perfectly fine for TeX.SE. – Teepeemm Nov 5 '18 at 18:47