The purpose of having it offshore? Few helicopters spend all their time offshore. Most fly onshore at least part of the time. And even offshore, it's glaringly obvious that we are still flying into the water. Something to remind us before we do that is worthwhile, IMO.
If you're going to assume that pilots will fly approaches without radar just because they have EGWS, then you have to also assume they'll fly them without an operable GPS, or anything else. Please give us credit for following the regulations. What I'm beginning to hear from you is "If I don't have it, then nobody should have it". I hope the message is garbled in transmission.