MongoDB 4.4 introduces the defaultRWConcern section in serverStatus https://docs.mongodb.com/manual/reference/command/serverStatus/#defaultrwconcern

However, this does not appear to be collected in FTDC.
This information is important since the https://docs.mongodb.com/manual/reference/command/serverStatus/#mongodb-serverstatus-serverstatus.opWriteConcernCounters.insert and related statistics use the catchall of "none" for these operations. Translating "none" to majority in 5.0 could become important.