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Outside the laboratory, so in real application, it's very common to want to load a set of entity per ids. Of course, like DBs, Hibernate gives an high importance to primary keys so IDs.
The following uses cases are all use in real application that perform extremely fast.
1- From a set of entities that are stales due to expiration or cluster invalidation notification(s), refresh them using the well known IDs, and do so in batch.
2- Loading the sets of lazy collections in batch without having to implement myself the IN clause chunking for each DB and application I'm working on.