Secured by Design: an outdated concept or still core to good security practice?

Security professionals have long been persuaded that the design of the environment is crucial to making it less attractive to criminals. The concept itself has received much academic and policy support. The question is; is it still relevant? Is it just an over complicated way of saying that physical security is effective? Or are there better theories and approaches which incorporate much more than design which while important, is merely a part of the process? Is it the case that we need to ad...