Breva may be well designed in terms of how it is made: of course that doesn't mean it's well designed for every purpose or to every taste or that it's well designed as a raw motorbike. (Ok, it's not meant to be a 'raw' bike – and the V.11 is much closer to that).
Some bikes are well designed, as comfy armchairs.
Some bikes are well designed as fashion items or jewellery.
Some bikes are well designed as cars: and so and so on...
Some bikes don't seem to be fastidiously designed – but they are great bikes.
I think you are right about the Griso, though I don't think that it will flop.
Generally I like it, but mostly because I like the idea that the machinery is much better sorted and that it is made to much better quality standards. – And that it is not the Breva. I very much want to see a real one. My fear is that this might be a bike designed as jewellery, slightly vulgar jewellery. From the pictures it looks a bit like the equivalent of a big gold medallion, to hang on the hairy chest of swarthy Italian Medallion Man. It may not be as bad as that in real life.
I think I might want one, but the bike is not 100% convincing. From the pictures, it's about 80% convincing.
I still think that the V.11 may be the last 'proper motorbike', in a rounded sense, to come from Guzzi.