I’m in two.
One has been established for nearly 20 years, some of the founder members are still in it. I was invited to join about 5 years ago (it’s invite only and yes, there’s a mutual trial period :-)). I love it tbh. They all really care about each other, they’ve been through bereavement, cancer, bankruptcy, redundancy, emigration - you name it. We also go away as a group at least once a year. People often meet up outside of book group. We always talk about the book - our secretary makes sure we do ;-). So yes the books are important but it’s the friendship that binds this group together. For the choices, one person comes up with a list of 4-5 books, then we vote for the winner from that. The book choices are generally pretty ‘literary’ but accessible which suits us all.
The other one is brand new, online only, and is an offshoot from a larger non-book network that I am part of, so I’m already friends with many of the people that come. It’s much less formal - there’s no membership as such, no ones expected to come to every meeting, it’s just read the book and turn up for a chat. It’s working because we mostly know each other already and talking about books is just another reason to get together. Because it’s online, it’s really easy to join - no hosting etc. The books are chosen very randomly! The organiser asks for suggestions, they are put on a FB group vote, then whoever wants to vote does so. I’m not really a fan of this way of doing it this way. People tend to propose their favourites, rather than looking for ‘good’ or interesting books.
My sister is in quite a literary book club. They are all English / American Lit post-docs minimum. There’s only 4-5 members max. She’s friends with one other person, but they hardly know anything about the other 2/3 - not where they live, who their partners are etc. They meet in a pub back room, there’s a bit a social chit chat then it’s down to serious book talk. They are very careful in their choices of books - I think they do it by mutual agreement, not voting or “it’s your turn to choose» etc.
So book clubs come in all sizes and shapes! For me, just talking about books wouldn’t be enough, especially if I didn’t like the choices or the method of choosing. I’d need to click with at least some of the others on a friendship level. And TBH it’s the friendships / socialising that makes up for having to read the occasional clanger. So maybe OP you’ll find one (or start one) that’s fits better.