It probably makes more sense on a traditional screenreader without any gyrometers.
That being said I've never experienced a problem on my phone. I (almost) always keep it locked in portrait, so KOReader's behavior wrt rotating is indistinguishable from my H2O. It's probably a little weirder if you allow it to rotate freely.
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I have one PDF with very wide margins, and I was able to get KOReader to re-scale the view so that I have just the parts of the page I want in view. I haven't seen any other ebook or PDF reader that will do that.
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Librera has some interesting features as well btw. But yes, this is why I believe that in most cases cases KOReader is simply the most convenient program, because I don't have to bug around zooming and dragging stuff.