Good points. PlanetScale's durability and reliability are built on replication - MySQL replication - and all the operational software we've written to maintain replication in the face of servers coming and going, network partitions, and all the rest of the weather one faces in the cloud.
Replicated network-attached storage that presents a "local" filesystem API is a powerful way to create durability in a system that doesn't build it in like we have.
Agreed, if you are a mature enough and well funded organization you probably should be using NVME and then run distributed systems on top of the NVMEs to manage replication yourself.
Replicated network-attached storage that presents a "local" filesystem API is a powerful way to create durability in a system that doesn't build it in like we have.