FDB is wildly underrated. Best DB atm
If you don't know about FDB; there's an amazing video about how they test it that really got me into learning more:
Its a bit of a vicious circle - because there is low exposure, no one is building those layers. Because no one is building the layers, there is no exposure.
Between Dynamodb, Cassandra, and Scylla seems like that problem set is somewhat a solved problem? I know those products continue to move forward, but they all work really well at this point and solve the fundamental problem to a good degree.