TopBunk - This 'agreement' came in when Back to Backs were imposed onto crew by Marshall & King. We all (the whole crew) had to go direct to the hotel and stay there - no getout clause...thats why it is still in place.
A bit like you being able to sit/ eat/sleep in a First Class seat that most cabin crew find unbelievable amongst full fare pax...are you willing to give up your agreement?? ...I don't think so.