"We found that due to these weak defaults, MongoDB’s causal sessions did not preserve causal consistency by default: users needed to specify both write and read concern majority (or higher) to actually get causal consistency. MongoDB closed the issue, saying it was working as designed, and updated their isolation documentation to note that even though MongoDB offers “causal consistency in client sessions”, that guarantee does not hold unless users take care to use both read and write concern majority. A detailed table now shows the properties offered by weaker read and write concerns."

That sounds like a valid redress, or am I missing something ?