There are many areas of improvement , especially in terms of DDL query routing. Even though it's masterless, DDL queries need to be sent to the coordinator node. Also, setting up a multi-node environment could be more straightforward.

Currently, setting up a multi-node environment is challenging. It's a bit tricky. Installation on each PostgreSQL node can lead to communication issues between nodes. An automatic rebalancing feature would be a significant improvement.

Currently, I have to manually command the rebalance. It would be more convenient if it was rebalanced automatically.

The dashboard and monitoring capabilities are good, but it would be helpful to have an integrated availability dashboard.

Citus Data needs to improve its stability. Do not consider this product if you have the budget. It is still developing and has a lot of issues. 

More features in monitoring and the reporting could make it better. It would be good if the solution offered a performance manager as well.