My point is about OGM users explicitly using the new multi-load API themselves; should they be presented with a warning (issued by OGM) if the given backend does not actually support that call and we thus need to do an entity-by-entity fallback. Or should we just do that fall-back and don't bother the user. You are right they likely won't have any other options, but you might want to learn about such shortcoming upfront instead of happily using the API and only later on finding out that it's not doing what it's promising.