The arguments claiming we have enjoyed security through a lack of market share have not held up. I was more sympathetic to that view when we had a young OS X platform, but eight years in and after substantial market share growth we still have yet to see a single serious malware threat emerge. We've seen various vulnerabilities exposed but very few real exploits, none of which have been really threatening. Anyone who continues to make those simplistic arguments has failed to recognize the reality of the situation, which has demonstrated that OS X's reputation of strong security is based on more than being a minority platform. Of course, Apple should always be looking to improve security while not making it too obtrusive or taking away too much of the user's right to exercise control over the system. More finely granulated control over software permissions would be a good thing if properly implemented.