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Because maybe the Android readers don't use the metadata. Rubbish library interface that's little more than file browser. You need KOReader and its ability to use Calibre data. Even then a poor library browsing experience compared to Kobo or Kindle.
The Kobo is so good to use BECAUSE it imports data to the database.
Also most Android uses the MS/Zune derived MTP which is slow and breaks easily compared to USB Mass Storage used by Sony PRS series, Kindle & Kobo etc. The advantage of Andriod eink is being able to add apps, for DRMed walled gardens. The disadvantage is abysmal Library views and Android which is a half baked unfinished layer on top of Linux kernel. Android 11 isn't much better than 6. Use of storage, SD card, printing etc varies erratically from version to version. Google's Material Design guidelines ignore 30 years of UX & GUI experience.
I have many Android things and an Android eink. Useful, but to browse library and read ebooks the Kobo is best and Kindles 2nd best (and a long way behind with Calibre)
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