This is a manifestation of one of the core problems with Sixt's branding, at least in the US. If you read their investor reports, they claim to position themselves as offering affordable luxury. They claim they are not a premium brand, but a discounter offering premium vehicles.

This is resulting in a lot of confusion in the US. If someone reserves a BMW, they probably expect a certain customer experience, even if they paid much less than the $250/day rate or whatever someone like Avis would charge. Then the customer sees policies that remind them of renting an econobox from Enterprise or Rent a Wreck. I don't know how Sixt can or will try to resolve this paradox. But if they're serious about understanding, and conforming, to the demands of the American market, I think they need to, and soon.