When I first read the facelift part I too was disappointed, but the more I think about it, I don't think that's such a bad thing.
The design of the Chiron is stunning, so why mess with a good thing? I think more and more brands are realizing that Porsche's strategy with the 911 is the winning formula. Just keep perfecting an already outstanding design. Rolls Royce has now done that with the 2 generations of the Phantom, and Range Rover has now done it with 2 generations of the top Rover. Something that Mercedes should have definitely done with the SL.
And Bugatti now has so many hallmarks of the brand that I don't think are ever going anywhere. The horseshoe grill, the central spine, the sweeping C on the side, and the light bar that extends the entire rear.