I think the arrangement makes sense (for now, until the market explodes with dedicated ebook readers, frabjous day), and aren't most of the devices you mention like the jetbook actually regular notebooks and not dedicated reader devices?
EDIT: nevermind, found them on the wiki
https://wiki.mobileread.com/wiki/JetBook > confusing because there is also a company making notebook under the same name.
https://wiki.mobileread.com/wiki/Dr._Yi
< not affiliated with MR in any way.
I guess it'll make much more sense when you buy a dedicated reader and can skip straight to the forum you want