[filmgirlcw]

With respect -- a long haul flight in economy (or even premium economy) and a long haul in business class (not to mention first class on airlines that offer that) are VERY different experiences.

In many business class seats, they are designed so that you cannot even see the person adjacent to you unless you specifically put your head out of the curved herringbone shell -- and that's when you're sitting. If you're laying flat, your head is completely obscured by the seat.

Delta and Qatar have doors on some of their business class seats.

People walking through the cabin can observe people sleeping, of course -- but these products are literally designed for sleeping and privacy. It's one of the reasons they charge such a premium for those tickets.