It's hard to tell from the pictures, but I think if they build up the front of the seat, many would like it. It seems they might do this.
You do tend to move forward into the tank after ever bump.
When I'm in leathers, which stick pretty good to the stock seat, and I hop off after a decent ride, the stock seat cover has significant pushed-forward wrinkles. I've been edging forward but my leathers have been pulling the top of the seat fabric forward with me. I'm half expecting the rear stitching to burst.
It does make me curious about alternatives like the Norton seat, but I'm not inconvenienced nearly enough to spend anything.
Anyway, the Luimoto cover does look sweet. The racing one on their website looks pretty good too.
Race Seat Covers for the KAWASAKI NINJA 400 18-20
www.luimoto.com