I know it's pain. Actually, I believe the law is non-specific on purpose. That way there is less argument about "well my idea works the same, how come it's not approved" and other issues that the bureaucrats don't want to deal with.
As far as easily broken into, short of a safe or concrete room with security door, a determined person can get into any storage system pretty easily with a few tools.
I believe the intent to prevent un-authorized access to firearms by kids and in the heat of a dispute. Maybe try checking on the General Firearms Forum or Legalese. A search here will likely turn up lots of opinion ....... and maybe some facts.
You could also call the RCMP, but there is no guarantee that you will get to talk to someone who is knowledgeable about storage requirements. There are of course lots of knowledgeable people there....you just might not be able to talk to them.
Or look at it this way. A locked soft case can be broken into with a knife, box cutter or scissors. A hard plastic case can be broken into with a dremel tool or hacksaw, maybe even a pin punch and a hammer. So can a metal case. In reality, the soft case provides about the same protection from unauthorized access.