Theoretically, you may be right. But in practice, Redis was designed from the ground up with data structures that are heavily optimized for RAM, whereas traditi

Theoretically, you may be right. But in practice, Redis was designed from the ground up with data structures that are heavily optimized for RAM, whereas traditional databases like PostgreSQL are heavily optimized for disk storage with RAM buffers. Although every database will benefit from faster storage, it will take at least several months, but more likely a few years, to modify traditional databases to take full advantage of the new paradigm. Redis on the other hand will probably require much fewer modifications.