The problem with this design is that it makes it a lot easier to have a big lever (eg. using a bolt cutter) on the frame. That's why folding locks are effective

The problem with this design is that it makes it a lot easier to have a big lever (eg. using a bolt cutter) on the frame. That's why folding locks are effective: Not because of their raw strength but because of their awkwardness that makes finding a lever harder. The real solution would be a police that takes bike theft seriously.