This is simply the part of the current flag which is not the Union Jack, submitted here for sake of completeness and in contrast to some of the other 'busy' designs.
The New Zealand stars remain exactly the same, not enlarged or aggrandised. The void left by the Union Jack speaks to the maturity of genuine self-determination, without having to create new iconography/branding or appropriate that used in the military, sporting, or corporate arena.
It would be a strong but humble flag that said we're fine as we are, by ourselves, an independent nation surrounded by ocean and sky. It remembers the past without trying to replace it with something else; simply recognising that we've moved on without really changing, and that we need nothing else to prop up our core national identity.
This should appeal to people who see understatement, independence, and a sense of perspective as distinctive New Zealand traits.
As a minimalist, timeless New Zealand flag it also leaves space for adaptation: it is compatible with using specialist/expressive flags (like the Lockwood silver fern flags) for specific purposes (eg sporting events), without over-committing, nationally, to a more complex design that might look dated in 50 years.