I hear you. It's not broken. It does serve the primal use cases like shelving, reviews/ratings, meta-information pretty well. But there is also so much more to the experience of reading. Is Goodreads really the best we deserve?
Like what? For me, most of the experience of reading is:
1 - actually reading the book
2- sharing my thoughts/recommending it
3 - seeing what other people recommend.
Goodreads, Youtube and Reddit cover all my needs for #2 and #3, and any attempt to cover the social aspect of it will pale in comparison to those 3, at least regarding #3.
For instance, there are things that I don't like about Twitter, and Mastodon has some things that I like, like being able to tag a specific post as NSFW, or add a spoiler tag to make part of the text hidden. But after a few months of using it in parallel to Twitter, I ended up abandoning it, because ''everyone''[0] is on Twitter.
[0] I mean: my real life friends, my online friends, bloggers, youtubers, cosplayers, illustratos, support profiles for online stores and services.