As SLF I've often wondered at what point the cabin crew are told to buckle up too. There's no point them unnecessarily risking their necks for the sake of some passenger's G&T.
Agreed, and I've been on a couple of flights in cruise where the flight crew announced over the PA "cabin crew please be seated." They promptly complied. I don't know what criteria was used to make that judgement, but given that things got pretty bumpy afterwards, they saw something was coming up.