DaveReidUK
The presumption is that the bins will normally bulk out before the weight limit is reached.
The latches also fuse out the load by popping open while the bin stays attached. I've seen bins dislodged completely even on "repairable" aircraft but that also included a pretty big twist in the fuselage during an event.
I'm always amazed by the amount of side walls and ceilings that dislodge in the aft toilets when things get really bumpy