Honest question: why would I want a distributed scale-out RDBMS based on SQLite when there are others based on more performant server-based solutions (see Citus for PostgreSQL, Galera for MySQL, etc)

My understanding/recollection of SQLite is that it has significant performance issues with high concurrency. Great for a database on a pocket device, not the best choice for a horizontal scale-out high-concurrency system. At what point do I need horizontal scalability, but not care about concurrency on any one node?

Again, honest question - I'm not doubting the project or its value, I just don't get it.