What I said is a personal opinion.. its upto buyer if they want a cleaned car at dealership or take it and get it detailed and ceramic coated at outside detailing shops.
I agree to the mindset but In anycase an expert detailing shop is way way better than a pre delivery wash a dealer. Its not just using highend shampoo, or microfiber.. there is more to it.. a single entrapped dirt particle in a high end expensive microfiber is enough to ruin the clear coat. In brief, the procedure matters as well.
Again i leave it to buyers to make decision about it.