Earlier quoted context omitted.
PgSQL only defect was anomaly in reads which caused transaction results to appear a tiny bit later, and they even mentioned that it is allowed by standards. No data loss of any kind. MongoDB defects were, let's say, somewhat more severe [2.4.3] "In this post, we’ll see MongoDB drop a phenomenal amount of data." [2.6.7] "Mongo’s consistency model is broken by design: not only can “strictly consistent” reads see stale…
In attempt to understand your motives in this discussion, I would like to ask question: * why you are referring on 12yo reports for very early MongoDB version?
This discussion refers to the entire history of MongoDB reports, which shows a lack of care about losing data.
If you wish to have a more recent MongoDB report, Jepsen is available for hire, from what I understand.