DuckDB would've been a good example to be included, because it tries to target the need for horizontal scalability with an efficient implementation altogether.

DuckDB would've been a good example to be included, because it tries to target the need for horizontal scalability with an efficient implementation altogether. If your use case stays below the need for horizontal scalability (which in the modern world, mixture of clever implementation and crazy powerful computers do allow), then you can tackle quite a large workload.