I don't really know if that matters for this use case. Just by the very nature of source_data -> processing -> dest_data taking nonzero time anything consuming

I don't really know if that matters for this use case. Just by the very nature of source_data -> processing -> dest_data taking nonzero time anything consuming dest_data must already be tolerant of some amount of lag. And how it's coded guarantees you can never observe dest_data going new -> old -> new.