Regarding MySQL improvements, a pain point is horizontal scalability. MySQL scales very well vertically and can support read replicas, but as a system grows significantly, sharding and distributed data management can become complex compared to databases that are designed to scale horizontally from the beginning. This is one of the areas where I think MySQL should work more. Another area is handling very large analytic workloads. MySQL is excellent for transactional systems, but for large-scale analytics or reporting, specialized analytic databases may sometimes be a better fit. Apart from that, one area is performance troubleshooting. As the database grows, diagnosing things such as slow queries, lock contention, and deadlocks becomes complex.
