RFD 53 addressed why they avoided NoSQL in general:
"NoSQL systems (e.g., Cassandra, Riak). The challenges of building relational, transactional applications atop these systems is well known. These systems also generally predate the modern emphasis on hands-off operation, which is critical for supporting a system that we will not be operating directly."
My point is to conflate the entire non-relational category into this bucket when one of the two items referenced peaked >10 years ago and the other isn't generally strongly consistent at write time, transactional, or with strongly consistent secondary indexes, is a limited and misleading POV https://db-engines.com/en/ranking
"NoSQL systems (e.g., Cassandra, Riak). The challenges of building relational, transactional applications atop these systems is well known. These systems also generally predate the modern emphasis on hands-off operation, which is critical for supporting a system that we will not be operating directly."
https://rfd.shared.oxide.computer/rfd/0053#rfd48