I suppose it depends on your interpretation of “fairly easy”. It takes some detailed planning on the homeowner’s part, but was simpler and quicker than remodeling the kitchen. Finding contractors, welders, etc. who can install bars and security gates is a little harder, but they’re out there.
Yes, most of the fun electronic gizmos passed off as “security” at Best Buy are little more than talismans, which we hope the bad guys will see and decide to self-correct. Maybe it’ll work, but not on the determined and truly violent.