When shotguns discharge at closing the problem is with poor sear/tumbler fitting, not the lack of an intercepting sear. A properly fitted sear is totally safe without other "devices". No reason for a gun owner to have a box lock, or a sidelock without intercepting sears, that is unsafe. You can have light trigger pulls and have them totally safe at the same time. I've got lots of them.
If you're unsure about the sear/tumbler engagement on a gun, check to ensure it is unloaded then push the safety off and bump the butt on the floor (on a rug to prevent butt damage) to see if it discharges. If you can't make it go off, don't worry about it.
