Here's what seems to me comprehensive list: https://foundationdb.github.io/fdb-document-layer/known-differences.html https://foundationdb.github.io/fdb-documen

Here's what seems to me comprehensive list: https://foundationdb.github.io/fdb-document-layer/known-differences.html https://foundationdb.github.io/fdb-document-layer/known-diff... Looks like there are definitely some shortcomings, but also some wins... From the link: > Sessions > MongoDB® has introduced sessions in v3.6. The Document Layer doesn’t support sessions yet. Sessions in MongoDB® enable better consistency guarentees. It’s important to note that, even though the Document Layer doesn’t support sessions, it has better consistency guarentees by default due to FoundationDB backend.