I think it's the class/size along with cost savingsPeople like myself do buy sedans and carry rear seat passengers. Honestly how stupid is it to sacrifice rear passenger comfort by deleting rear air vents. I realize Honda isn't the only car maunfacter deleting rear air vents on most sedan offerings nowadays. I'm glad I now have an option to remedy this . Thanks for Posting this information.
Its offered in other markets and in ours has a plug blocking the connection. Worst case you close the rear vents when no one is in the rear seatsWon’t this lower the front air pressure as possibly the system was not designed for this added volume of air conditioning?