Need? Not really, but I really enjoy running KOReader on my Kobo, which gives me a LOT of capabilities that the built in reader does not.
I can reformat books on the fly if something is bugging me, it has way better reading stats, way better book map, translations (something I missed from my Kindle), swipe gesture configuration, clipboard to QR to allow me to share passages that I enjoy via whatever I want on my phone, I can connect directly to ODPS feeds or Calibre wirelessly, I can completely turn off the front-light if I’m outdoors and don’t need it, I can look up words in definitions if the dictionary definition has a word that I don’t know, etc, etc… as well as a huge number of features that I don’t personally use.
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