Yes, you can think this way. But I need to add, that YDB is also a platform for developing distributed systems that store data. YDB provides a scalable and replicated storage with low latency, a conception of a tablet (that is also used in many systems) that implements distributed consensus. These building blocks are used for persistent queue implementation, block store, KV-tablets. These blocks are hard to develop and they are very good when you need to build something new or optimal for a specific problem. OLTP is an example of such a problem. But yes, we were building YDB to support OLTP workload initially.

Very cool.