I think you are overestimating the knowledge of sales people. Manufaktur is rare. Walk in to a dealer and you'll be speaking to someone used to selling A180 and might have never even driven an S-Class. You might even be ignored for 10-15min. Once you speak to them they might even be scrambling around to find a member of staff who knows about the S-Class or Manufaktur.
Contrast that with walking into a Bentley or Aston dealer. They have a wall of colour options and selection of inlays and materials to touch and look at. They might even offer to bring you a drink rather than pointing to where a filter coffee machine is.
The experience of feeling looked after and loved is secondary to the product. Ferrari does this exceptionally well including inviting prospects to spec the car at the factory.
Ranting aside, This is the type of highly specced S-class that I would look out for in classifields at 60% discount in 5-10 years. I love the exterior colour. It is similar to one that Rolls Royce has used on a few cars.