Thanks! Did you consider any other options?
TiDB is another competitor but mysql dialect and still early, missing lots of features.
For pure data-warehousing, we used MemSQL which is incredibly fast but can be expensive.
SQL Server is a great all around database if you want in-memory tables, columnstores, native graph queries, full-text search, and very high performance and can live with a single-node design (with optional HA cluster).
Being able to just drop the DB into a k8s cluster and not worry too much about failover gotchas and leader election has a lot of value. As does being able to throw more nodes on for more performance. Complicated OLAP queries aren't in scope.
Performance is fine, why do you say it's scary? OLAP will just be slow, but it's also distributed and unoptimized. Highly concurrent OLTP can't really get slow unless you're trying to stretch the cluster over multiple geo regions.