One more question - did you have a chance to see where scylladb is going?
On latest conference their CEO said it's all about serverless and virtualization. Having kubernetes doing all the work [1] - "we are doing it automatically for you with our management which is based on using multi-tenant kuebrentes deployment". Even more surprising is that instead of using NVMEs they want to use s3 for backend storage and NVME is only cache [2] :o I am not database expert, but this is very interesting.