> Our storage is sharded and bottomless.

Anyone can claim this and LVM together 20 64TiB EBS volumes and put them on one big node. That's not sharding or bottomless.

Sharding and a shared nothing have incredible benefits to anyone who has a requirement for uptime, scalability, and cost reduction. We’ve avoided supporting parts of MySQL that make scaling worse and are working to add them back in ways that work, like FKs. In return for not supporting all MySQL features we hand back an immense amount in return. This is something our customers have been happy with.