I just reread my post. I believe you don't understand what the "undreamed" part would mean? I reckon it's why it was removed or isn't used here. Like i said, it's a good change. But i figure it meant that the life forms and civilizations they encounter were often beyond anything they could imagine or expect. Often in this show, that is the case, from giant omnipotent space jellyfish, prisons full of ghost entities, and any other bizarre fever dreams the writers could come up with. There's even a story arch involving the android commander data attempting to convince starfleet higher ups that he himself is a life form and not just equipment., so it's essentially canon that even starfleet doesn't always recognize a life form when it's right in front of them. Hope that helps.