IBDS- there is nothing new here. BA has been operating with totally separate Flight Crew & Cabin Crew departments & rostering systems for umpteen years. When I flew shorthaul. I had occasionally 4 Cabin Crews in a day. Why do they need so much briefing?- the whole crew are professionals, let them get on with it. The BA experience seems to be the pilots actually operate more flights than the Cabin Crew. Whilst I wouldn't condone this system, I don't feel a finger can be pointed at it to say it's 'unsafe'. More of a hazard is the pressure from over-rapid turnarounds and other areas I think.