This one I'm not sure how to explain.
There's quite a lot of issues that are, I think, derived from automatic imports. I read a lot of unknown indie romances, so I come across these issues A LOT.
There a lot of books with only title and author and NO other data. Now, it would be great if there was a way to add the isbn or external id and it would actually GET the data from those the same way it does when you create a book from scratch with ISBN. Right now, it does nothing but make the information available in the book's page as far as I'm aware.
So either: update data when adding isbn/external id
Or: let me delete the book and add it with isbn with all the info at once. but that one is dangerous and would probably have very restricted access for obvious reasons.

(sidenote: getting rid of random summaries and annotations of books being on here, like, as if they were books, not in reviews, would be huge as well. My books keep importing as summaries of themselves instead of the actual book, and they keep showing up in searches. They don't really belong on a platform like this, they're not books. I'm guessing they came from a batch import of another database, but they really need a cleanup)

Related to this: i don't know if this "only title and author" book thing is something the automatic import did before it was improved but if it was that, and if it still does it, that needs an emergency fix imo. I doubt it does though.

Descriptions: adding the descriptions to the books when importing. I'm a bad example because I read hundreds of unknown indie books a year, but most of the books I've added, the ones that I didn't manually create, don't have a description (or a cover). It would be FANTASTIC if that could be incorporated. Particularly if it was doable by simply adding the isbn or external id, because I'm guessing a lot of manually added books are probably missing it as well.

Released status: books seem to be set to unreleased by default. I think the opposite would make A LOT more sense.

Language, country, etc: if this data could also be automatically added when importing the book through isbn/external id that would be a big relief. I'm pretty sure that field is empty on a big percentage of the database (oh how I hope there's a way to batch edit that some day, even if just for devs), but it's important data and might help with messy editions. Searching, browsing or filtering by country or language is something I'd absolutely love, but I wouldn't even requesting right now because too much data is missing