About 7,000 ebooks on Sage and native search works well with native ereading and also metadata library works very well.
My KOReader strategy is to re-install it when it has metadata interface instead of (or as well as) a file brower and Search that's easier to use. Apparently it's being worked on.
My Kindle DXG, K3 and PW3 are easier to find ebooks on than KOreader. I still have it on an Android eink.
35 years ago I had CP/M library software that used metadata and had quick search on a floppy. 27 years ago DOS library software and 21 years ago Windows Document management system. None of those had user browsing of the file system.
The snag with KOReader is that it's a full featured customisable document reader with no Library interface. So I fix ebooks or PDFs before copying them to Kindle, Kobo, phone or tablet.
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