>>For me this makes the NCAP rating useless

That's fine, and fortunately for you, you can still buy and operate that vehicle legally, it's fine. However you might and should expect the insurance on it to be appropriately higher than a 5-star rated vehicle.

>>Also consider that the new NCAP ratings aren't about real safety.

That's exactly what they are about, just because you don't care about those systems doesn't mean they are not about safety. If you didn't care about airbags that wouldn't suddenly make the test that requires them "not about safety".