They are getting slightly better at designing the interior layouts on new motorhomes latterly, but imho they still have a long way to go in terms of function before form. As well as not very well thought out design, the new mohos are all very nice, but often when you scratch under the surface the materials and build quality also leave a lot to be desired.
In many ways poor design is often camouflaged by flashy looking 'fashion' fittings which seduce the buyer (or more likely the buyer's wife - sorry to be sexist and non-PC, but it's likely true in many cases!) who can't see beyond the glitz.
Makes you realise why so many people go down the route of building their own camper. I certainly would if was young enough and had the time and skills.
My all time favourite camper van would be something like Banjobilly's, aka Bill Lloyd, a Swedish caravan with a fabulous & really comfy interior, plonked onto the flatbed of a Mercedes truck and the whole lot painted army green!
But we all have very different requirements/likes/dislikes so it's each to their own...