True, having Android on it definitely has advantages. You can read RSS feeds easier, use established note taking tools etc. But it comes with its own set of downsides. It’s definitely not pointless!
Regarding battery, sure a week is nice when compared to an iPad or Android tablet. But a dedicated reader running for a month is hard to beat :)
I just looked up the weight of the Boox Note Airs C and it’s actually lighter than I remembered. 410g compared to Elipsa 2E at 390g. That’s pretty nice.
I would set it up like this. Everything you have in Calibre Web, or only on a shared shelf, will show up in your Kobo reader book section and is ready to download.
No plugins or extra software, it just works.
https://brandonjkessler.com/technology/2021/04/26/setup-kobo-sync-in-calibre-web.html