Comment by severine

Yeah, they're the same reasons for me, but I'd like to say that depending on your use case, some stock firmwares are ok.

Recently, my father bought the same eink device I have (Kobo Clara HD), and I promptly installed KOReader only to realize that the stock Kobo firmware (which, btw, you can and should update even if you use KOReader) is perfectly fine for him, and in fact better for his experience than the enormous amount of options and menus that KOReader offers.

For me it's KOReader all the way, as I love the freedom, the fine-grained configuration possibilities, the connectivity. It's great that it exists.