I've been of the opinion that bins should auto-lock for takeoff and landing.

Unlock on climb/cruise when the sign comes off (or maybe 10K), and at the gate with sign off.

Of give the FA's a lock/unlock switch.

Without locking bins, I think the certification ASSumptions are suspect. Although I have to admit there have been some spectacularly (surprisingly) successful evacs in recent memory, seconds before the plane was consumed in flames.