Originally Posted by
MikeMpls
The safety lock might not work unless its default state is locked, because in some emergencies (inc. US 1549) what limited battery power is left must be preserved for essential functions (e.g. flight controls). Over time that probably would result in a lot malfunctions at the gates when they don't unlock on command.
Also, haven't overhead bins come loose even in bad turbulence or hard landings? If they were all attached by such a system, they could impede evacuation even more.