[yearesadpeople]

BFF pattern is very much misunderstood, and very much over-used IMHO

Perhaps most useful - in highly distributed systems - I've seen is when we require some kind of flow orchestration, where we wouldn't like the orchestration logic at the API implementation (or indeed require the downstream services to not have to consider different contexts).

[edit] Quite useful when designing nice clean, dedicated, new APIs and having to deal with legacy systems (perhaps data pertaining to the shiney new API model is housed in a legacy model): a useful means to keep moving forward.