> Why even consider ZK in 2024?

I'm no expert on these consensus-stores, but I guess my question would be "why not?" ZK is proven and works.

Great question

Since it's written ZooKeeper/etcd-based, I assume they use ZK and are going over to Etcd.

Dropbox has been using Zookeeper since the beginning. I assume they are just familiar with running it and understand its guarantees better.